21004213113 has 24 divisors (see below), whose sum is σ = 33883344768. Its totient is φ = 12925667664.

The previous prime is 21004213093. The next prime is 21004213151. The reversal of 21004213113 is 31131240012.

21004213113 is a `hidden beast` number, since 210 + 0 + 421 + 31 + 1 + 3 = 666.

It is not a de Polignac number, because 21004213113 - 2²⁹ = 20467342201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004213183) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3321345 + ... + 3327662.

It is an arithmetic number, because the mean of its divisors is an integer number (1411806032).

Almost surely, 2^21004213113 is an apocalyptic number.

It is an amenable number.

21004213113 is a deficient number, since it is larger than the sum of its proper divisors (12879131655).

21004213113 is an equidigital number, since it uses as much as digits as its factorization.

21004213113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6649035 (or 6649023 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21004213113 its reverse (31131240012), we get a palindrome (52135453125).

The spelling of 21004213113 in words is "twenty-one billion, four million, two hundred thirteen thousand, one hundred thirteen".