212320840 has 16 divisors (see below), whose sum is σ = 477721980. Its totient is φ = 84928320.

The previous prime is 212320831. The next prime is 212320847. The reversal of 212320840 is 48023212.

It can be written as a sum of positive squares in 2 ways, for example, as 203404644 + 8916196 = 14262^2 + 2986^2 .

It is not an unprimeable number, because it can be changed into a prime (212320847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2653971 + ... + 2654050.

Almost surely, 2^212320840 is an apocalyptic number.

212320840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212320840 is an abundant number, since it is smaller than the sum of its proper divisors (265401140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212320840 is a wasteful number, since it uses less digits than its factorization.

212320840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308032 (or 5308028 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 212320840 is about 14571.2333040138. The cubic root of 212320840 is about 596.5738433605.

The spelling of 212320840 in words is "two hundred twelve million, three hundred twenty thousand, eight hundred forty".