2152221764 has 48 divisors (see below), whose sum is σ = 4772777856. Its totient is φ = 824774400.

The previous prime is 2152221749. The next prime is 2152221769. The reversal of 2152221764 is 4671222512.

It is a self number, because there is not a number n which added to its sum of digits gives 2152221764.

It is not an unprimeable number, because it can be changed into a prime (2152221769) 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, 38489 + ... + 76064.

It is an arithmetic number, because the mean of its divisors is an integer number (99432872).

Almost surely, 2^2152221764 is an apocalyptic number.

It is an amenable number.

2152221764 is an abundant number, since it is smaller than the sum of its proper divisors (2620556092).

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

2152221764 is a wasteful number, since it uses less digits than its factorization.

2152221764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114636 (or 114634 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 2152221764 is about 46392.0441886322. The cubic root of 2152221764 is about 1291.1073087572.

The spelling of 2152221764 in words is "two billion, one hundred fifty-two million, two hundred twenty-one thousand, seven hundred sixty-four".