212172406788 has 24 divisors (see below), whose sum is σ = 495387775008. Its totient is φ = 70678589056.

The previous prime is 212172406759. The next prime is 212172406811. The reversal of 212172406788 is 887604271212.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5673906 + ... + 5711177.

It is an arithmetic number, because the mean of its divisors is an integer number (20641157292).

Almost surely, 2^212172406788 is an apocalyptic number.

It is an amenable number.

212172406788 is an abundant number, since it is smaller than the sum of its proper divisors (283215368220).

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

212172406788 is a wasteful number, since it uses less digits than its factorization.

212172406788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11386643 (or 11386641 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 212172406788 in words is "two hundred twelve billion, one hundred seventy-two million, four hundred six thousand, seven hundred eighty-eight".