21106501320 has 64 divisors (see below), whose sum is σ = 63373544640. Its totient is φ = 5623596800.

The previous prime is 21106501313. The next prime is 21106501321. The reversal of 21106501320 is 2310560112.

It is not an unprimeable number, because it can be changed into a prime (21106501321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67255 + ... + 216185.

It is an arithmetic number, because the mean of its divisors is an integer number (990211635).

Almost surely, 2^21106501320 is an apocalyptic number.

21106501320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21106501320 is an abundant number, since it is smaller than the sum of its proper divisors (42267043320).

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

21106501320 is a wasteful number, since it uses less digits than its factorization.

21106501320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150126 (or 150122 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The spelling of 21106501320 in words is "twenty-one billion, one hundred six million, five hundred one thousand, three hundred twenty".