402424013021 has 4 divisors (see below), whose sum is σ = 410986226112. Its totient is φ = 393861799932.

The previous prime is 402424013003. The next prime is 402424013027. The reversal of 402424013021 is 120310424204.

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 a de Polignac number, because none of the positive numbers 2^k-402424013021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402424013027) 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, 4281106475 + ... + 4281106568.

It is an arithmetic number, because the mean of its divisors is an integer number (102746556528).

Almost surely, 2^402424013021 is an apocalyptic number.

It is an amenable number.

402424013021 is a deficient number, since it is larger than the sum of its proper divisors (8562213091).

402424013021 is an equidigital number, since it uses as much as digits as its factorization.

402424013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8562213090.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 402424013021 its reverse (120310424204), we get a palindrome (522734437225).

The spelling of 402424013021 in words is "four hundred two billion, four hundred twenty-four million, thirteen thousand, twenty-one".