2021400401 has 4 divisors (see below), whose sum is σ = 2026908672. Its totient is φ = 2015892132.

The previous prime is 2021400389. The next prime is 2021400421. The reversal of 2021400401 is 1040041202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021400401 - 2¹⁰ = 2021399377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021400421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2753585 + ... + 2754318.

It is an arithmetic number, because the mean of its divisors is an integer number (506727168).

Almost surely, 2^2021400401 is an apocalyptic number.

It is an amenable number.

2021400401 is a deficient number, since it is larger than the sum of its proper divisors (5508271).

2021400401 is an equidigital number, since it uses as much as digits as its factorization.

2021400401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508270.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2021400401 is about 44959.9866659233. The cubic root of 2021400401 is about 1264.3989189207.

Adding to 2021400401 its reverse (1040041202), we get a palindrome (3061441603).

The spelling of 2021400401 in words is "two billion, twenty-one million, four hundred thousand, four hundred one".