821126672 has 20 divisors (see below), whose sum is σ = 1594570560. Its totient is φ = 409624608.

The previous prime is 821126653. The next prime is 821126693. The reversal of 821126672 is 276621128.

It is a super-2 number, since 2×821126672² = 1348498022939591168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51428 + ... + 65475.

It is an arithmetic number, because the mean of its divisors is an integer number (79728528).

Almost surely, 2^821126672 is an apocalyptic number.

It is an amenable number.

821126672 is a deficient number, since it is larger than the sum of its proper divisors (773443888).

821126672 is a wasteful number, since it uses less digits than its factorization.

821126672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117350 (or 117344 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 821126672 is about 28655.3079201742. The cubic root of 821126672 is about 936.4186465801.

The spelling of 821126672 in words is "eight hundred twenty-one million, one hundred twenty-six thousand, six hundred seventy-two".