821073212 has 6 divisors (see below), whose sum is σ = 1436878128. Its totient is φ = 410536604.

The previous prime is 821073199. The next prime is 821073229. The reversal of 821073212 is 212370128.

It is a super-2 number, since 2×821073212² = 1348322438927993888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102634148 + ... + 102634155.

It is an arithmetic number, because the mean of its divisors is an integer number (239479688).

Almost surely, 2^821073212 is an apocalyptic number.

It is an amenable number.

821073212 is a deficient number, since it is larger than the sum of its proper divisors (615804916).

821073212 is a wasteful number, since it uses less digits than its factorization.

821073212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205268307 (or 205268305 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 821073212 is about 28654.3750935176. The cubic root of 821073212 is about 936.3983240854.

The spelling of 821073212 in words is "eight hundred twenty-one million, seventy-three thousand, two hundred twelve".