21650555010 has 32 divisors (see below), whose sum is σ = 59384380032. Its totient is φ = 4948698240.

The previous prime is 21650554999. The next prime is 21650555053. The reversal of 21650555010 is 1055505612.

It is a super-2 number, since 2×21650555010² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 51548731 + ... + 51549150.

It is an arithmetic number, because the mean of its divisors is an integer number (1855761876).

Almost surely, 2^21650555010 is an apocalyptic number.

21650555010 is an abundant number, since it is smaller than the sum of its proper divisors (37733825022).

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

21650555010 is a wasteful number, since it uses less digits than its factorization.

21650555010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103097898.

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 21650555010 in words is "twenty-one billion, six hundred fifty million, five hundred fifty-five thousand, ten".