21004089407 has 32 divisors (see below), whose sum is σ = 25828761600. Its totient is φ = 16671951360.

The previous prime is 21004089397. The next prime is 21004089409. The reversal of 21004089407 is 70498040012.

It is a cyclic number.

It is not a de Polignac number, because 21004089407 - 2¹⁶ = 21004023871 is a prime.

It is a super-2 number, since 2×21004089407² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004089409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1891682 + ... + 1902752.

It is an arithmetic number, because the mean of its divisors is an integer number (807148800).

Almost surely, 2^21004089407 is an apocalyptic number.

21004089407 is a deficient number, since it is larger than the sum of its proper divisors (4824672193).

21004089407 is a wasteful number, since it uses less digits than its factorization.

21004089407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11351.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 21004089407 in words is "twenty-one billion, four million, eighty-nine thousand, four hundred seven".