821621092 has 6 divisors (see below), whose sum is σ = 1437836918. Its totient is φ = 410810544.

The previous prime is 821621089. The next prime is 821621107. The reversal of 821621092 is 290126128.

821621092 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 604471396 + 217149696 = 24586^2 + 14736^2 .

It is a super-2 number, since 2×821621092² = 1350122437638544928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102702633 + ... + 102702640.

Almost surely, 2^821621092 is an apocalyptic number.

It is an amenable number.

821621092 is a deficient number, since it is larger than the sum of its proper divisors (616215826).

821621092 is a wasteful number, since it uses less digits than its factorization.

821621092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205405277 (or 205405275 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 821621092 is about 28663.9336449134. The cubic root of 821621092 is about 936.6065555550.

The spelling of 821621092 in words is "eight hundred twenty-one million, six hundred twenty-one thousand, ninety-two".