821268972 has 36 divisors (see below), whose sum is σ = 2080017576. Its totient is φ = 273224640.

The previous prime is 821268961. The next prime is 821268989. The reversal of 821268972 is 279862128.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3138 + ... + 40649.

It is an arithmetic number, because the mean of its divisors is an integer number (57778266).

Almost surely, 2^821268972 is an apocalyptic number.

It is an amenable number.

821268972 is an abundant number, since it is smaller than the sum of its proper divisors (1258748604).

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

821268972 is a wasteful number, since it uses less digits than its factorization.

821268972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44318 (or 44313 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 821268972 is about 28657.7907731912. The cubic root of 821268972 is about 936.4727367634.

The spelling of 821268972 in words is "eight hundred twenty-one million, two hundred sixty-eight thousand, nine hundred seventy-two".