21102012404 has 24 divisors (see below), whose sum is σ = 40291053600. Its totient is φ = 9590539680.

The previous prime is 21102012391. The next prime is 21102012419. The reversal of 21102012404 is 40421020112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351887 + ... + 407465.

It is an arithmetic number, because the mean of its divisors is an integer number (1678793900).

Almost surely, 2^21102012404 is an apocalyptic number.

It is an amenable number.

21102012404 is a deficient number, since it is larger than the sum of its proper divisors (19189041196).

21102012404 is a wasteful number, since it uses less digits than its factorization.

21102012404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64223 (or 64221 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21102012404 its reverse (40421020112), we get a palindrome (61523032516).

The spelling of 21102012404 in words is "twenty-one billion, one hundred two million, twelve thousand, four hundred four".