2421016021 has 4 divisors (see below), whose sum is σ = 2499113344. Its totient is φ = 2342918700.

The previous prime is 2421016009. The next prime is 2421016027. The reversal of 2421016021 is 1206101242.

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 2421016021 - 2²¹ = 2418918869 is a prime.

It is a super-2 number, since 2×2421016021² = 11722637147877344882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2421016021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421016027) 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, 39048615 + ... + 39048676.

It is an arithmetic number, because the mean of its divisors is an integer number (624778336).

Almost surely, 2^2421016021 is an apocalyptic number.

It is an amenable number.

2421016021 is a deficient number, since it is larger than the sum of its proper divisors (78097323).

2421016021 is an equidigital number, since it uses as much as digits as its factorization.

2421016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78097322.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2421016021 is about 49203.8212032358. The cubic root of 2421016021 is about 1342.7625529975.

Adding to 2421016021 its reverse (1206101242), we get a palindrome (3627117263).

The spelling of 2421016021 in words is "two billion, four hundred twenty-one million, sixteen thousand, twenty-one".