2520021401 has 4 divisors (see below), whose sum is σ = 2668257972. Its totient is φ = 2371784832.

The previous prime is 2520021397. The next prime is 2520021437. The reversal of 2520021401 is 1041200252.

2520021401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1745234176 + 774787225 = 41776^2 + 27835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520021401 - 2² = 2520021397 is a prime.

It is a super-2 number, since 2×2520021401² = 12701015722996005602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 148236553 = 2520021401 / (2 + 5 + 2 + 0 + 0 + 2 + 1 + 4 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2520021401.

It is not an unprimeable number, because it can be changed into a prime (2520021451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74118260 + ... + 74118293.

It is an arithmetic number, because the mean of its divisors is an integer number (667064493).

Almost surely, 2^2520021401 is an apocalyptic number.

It is an amenable number.

2520021401 is a deficient number, since it is larger than the sum of its proper divisors (148236571).

2520021401 is a wasteful number, since it uses less digits than its factorization.

2520021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148236570.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 2520021401 is about 50199.8147506542. The cubic root of 2520021401 is about 1360.8222754119.

Adding to 2520021401 its reverse (1041200252), we get a palindrome (3561221653).

The spelling of 2520021401 in words is "two billion, five hundred twenty million, twenty-one thousand, four hundred one".