821370416 has 40 divisors (see below), whose sum is σ = 1605668064. Its totient is φ = 407024640.

The previous prime is 821370401. The next prime is 821370439. The reversal of 821370416 is 614073128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129445 + ... + 1130171.

Almost surely, 2^821370416 is an apocalyptic number.

It is an amenable number.

821370416 is a deficient number, since it is larger than the sum of its proper divisors (784297648).

821370416 is a wasteful number, since it uses less digits than its factorization.

821370416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 821370416 is about 28659.5606386420. The cubic root of 821370416 is about 936.5112932057.

The spelling of 821370416 in words is "eight hundred twenty-one million, three hundred seventy thousand, four hundred sixteen".