212231688 has 32 divisors (see below), whose sum is σ = 539280960. Its totient is φ = 69583680.

The previous prime is 212231671. The next prime is 212231693. The reversal of 212231688 is 886132212.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71020 + ... + 73947.

It is an arithmetic number, because the mean of its divisors is an integer number (16852530).

Almost surely, 2^212231688 is an apocalyptic number.

It is an amenable number.

212231688 is an abundant number, since it is smaller than the sum of its proper divisors (327049272).

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

212231688 is a wasteful number, since it uses less digits than its factorization.

212231688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145037 (or 145033 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 212231688 is about 14568.1738045645. The cubic root of 212231688 is about 596.4903326429.

The spelling of 212231688 in words is "two hundred twelve million, two hundred thirty-one thousand, six hundred eighty-eight".