21165540152100 has 36 divisors (see below), whose sum is σ = 61238962840944. Its totient is φ = 5644144040480.

The previous prime is 21165540152077. The next prime is 21165540152161. The reversal of 21165540152100 is 125104556112.

It is a happy number.

It is a super-2 number, since 2×21165540152100² (a number of 27 digits) contains 22 as substring.

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, 35275899954 + ... + 35275900553.

Almost surely, 2^{21165540152100} is an apocalyptic number.

21165540152100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21165540152100 is an abundant number, since it is smaller than the sum of its proper divisors (40073422688844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21165540152100 is a wasteful number, since it uses less digits than its factorization.

21165540152100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70551800524 (or 70551800517 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 21165540152100 in words is "twenty-one trillion, one hundred sixty-five billion, five hundred forty million, one hundred fifty-two thousand, one hundred".