21031004401 has 16 divisors (see below), whose sum is σ = 23168628288. Its totient is φ = 18931176000.

The previous prime is 21031004389. The next prime is 21031004441. The reversal of 21031004401 is 10440013012.

It is not a de Polignac number, because 21031004401 - 2⁵ = 21031004369 is a prime.

It is a super-2 number, since 2×21031004401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031004441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3882571 + ... + 3887983.

It is an arithmetic number, because the mean of its divisors is an integer number (1448039268).

Almost surely, 2^21031004401 is an apocalyptic number.

It is an amenable number.

21031004401 is a deficient number, since it is larger than the sum of its proper divisors (2137623887).

21031004401 is a wasteful number, since it uses less digits than its factorization.

21031004401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21031004401 its reverse (10440013012), we get a palindrome (31471017413).

The spelling of 21031004401 in words is "twenty-one billion, thirty-one million, four thousand, four hundred one".