21115511050 has 24 divisors (see below), whose sum is σ = 39772008000. Its totient is φ = 8339288880.

The previous prime is 21115511047. The next prime is 21115511069. The reversal of 21115511050 is 5011551112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2668900 + ... + 2676799.

It is an arithmetic number, because the mean of its divisors is an integer number (1657167000).

Almost surely, 2^21115511050 is an apocalyptic number.

21115511050 is a deficient number, since it is larger than the sum of its proper divisors (18656496950).

21115511050 is a wasteful number, since it uses less digits than its factorization.

21115511050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5345790 (or 5345785 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 22.

The spelling of 21115511050 in words is "twenty-one billion, one hundred fifteen million, five hundred eleven thousand, fifty".