21512510104 has 32 divisors (see below), whose sum is σ = 41502999600. Its totient is φ = 10446122880.

The previous prime is 21512510083. The next prime is 21512510183. The reversal of 21512510104 is 40101521512.

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, 92967 + ... + 227305.

Almost surely, 2^21512510104 is an apocalyptic number.

It is an amenable number.

21512510104 is a deficient number, since it is larger than the sum of its proper divisors (19990489496).

21512510104 is a wasteful number, since it uses less digits than its factorization.

21512510104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134923 (or 134919 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The spelling of 21512510104 in words is "twenty-one billion, five hundred twelve million, five hundred ten thousand, one hundred four".