21121660010 has 32 divisors (see below), whose sum is σ = 41549049792. Its totient is φ = 7666938880.

The previous prime is 21121659997. The next prime is 21121660033. The reversal of 21121660010 is 1006612112.

It is a super-2 number, since 2×21121660010² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108599 + ... + 232458.

It is an arithmetic number, because the mean of its divisors is an integer number (1298407806).

Almost surely, 2^21121660010 is an apocalyptic number.

21121660010 is a deficient number, since it is larger than the sum of its proper divisors (20427389782).

21121660010 is a wasteful number, since it uses less digits than its factorization.

21121660010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341638.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21121660010 in words is "twenty-one billion, one hundred twenty-one million, six hundred sixty thousand, ten".