21945100716 has 96 divisors (see below), whose sum is σ = 70933685760. Its totient is φ = 5700024000.

The previous prime is 21945100711. The next prime is 21945100733. The reversal of 21945100716 is 61700154912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21945100711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1311135 + ... + 1327766.

It is an arithmetic number, because the mean of its divisors is an integer number (738892560).

Almost surely, 2^21945100716 is an apocalyptic number.

It is an amenable number.

21945100716 is an abundant number, since it is smaller than the sum of its proper divisors (48988585044).

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

21945100716 is a wasteful number, since it uses less digits than its factorization.

21945100716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638932 (or 2638924 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 21945100716 in words is "twenty-one billion, nine hundred forty-five million, one hundred thousand, seven hundred sixteen".