21125050456 has 16 divisors (see below), whose sum is σ = 39645791640. Its totient is φ = 10552839360.

The previous prime is 21125050447. The next prime is 21125050481. The reversal of 21125050456 is 65405052112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201461 + ... + 1218916.

Almost surely, 2^21125050456 is an apocalyptic number.

It is an amenable number.

21125050456 is a deficient number, since it is larger than the sum of its proper divisors (18520741184).

21125050456 is a wasteful number, since it uses less digits than its factorization.

21125050456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421474 (or 2421470 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 21125050456 in words is "twenty-one billion, one hundred twenty-five million, fifty thousand, four hundred fifty-six".