21950260864 has 64 divisors (see below), whose sum is σ = 52148960640. Its totient is φ = 8998235136.

The previous prime is 21950260859. The next prime is 21950260867. The reversal of 21950260864 is 46806205912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21950260864.

It is not an unprimeable number, because it can be changed into a prime (21950260867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511959 + ... + 553174.

It is an arithmetic number, because the mean of its divisors is an integer number (814827510).

Almost surely, 2^21950260864 is an apocalyptic number.

It is an amenable number.

21950260864 is an abundant number, since it is smaller than the sum of its proper divisors (30198699776).

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

21950260864 is a wasteful number, since it uses less digits than its factorization.

21950260864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065177 (or 1065165 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 21950260864 in words is "twenty-one billion, nine hundred fifty million, two hundred sixty thousand, eight hundred sixty-four".