821474871 has 16 divisors (see below), whose sum is σ = 1252182528. Its totient is φ = 469260000.

The previous prime is 821474827. The next prime is 821474887. The reversal of 821474871 is 178474128.

It is not a de Polignac number, because 821474871 - 2⁷ = 821474743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821476871) 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, 100021 + ... + 107921.

It is an arithmetic number, because the mean of its divisors is an integer number (78261408).

Almost surely, 2^821474871 is an apocalyptic number.

821474871 is a deficient number, since it is larger than the sum of its proper divisors (430707657).

821474871 is a wasteful number, since it uses less digits than its factorization.

821474871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12862.

The product of its digits is 100352, while the sum is 42.

The square root of 821474871 is about 28661.3829219736. The cubic root of 821474871 is about 936.5509907399.

The spelling of 821474871 in words is "eight hundred twenty-one million, four hundred seventy-four thousand, eight hundred seventy-one".