212928921988 has 6 divisors (see below), whose sum is σ = 372625613486. Its totient is φ = 106464460992.

The previous prime is 212928921979. The next prime is 212928922001. The reversal of 212928921988 is 889129829212.

It can be written as a sum of positive squares in only one way, i.e., 212117355844 + 811566144 = 460562^2 + 28488^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26616115245 + ... + 26616115252.

Almost surely, 2^212928921988 is an apocalyptic number.

It is an amenable number.

212928921988 is a deficient number, since it is larger than the sum of its proper divisors (159696691498).

212928921988 is a wasteful number, since it uses less digits than its factorization.

212928921988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53232230501 (or 53232230499 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 61.

The spelling of 212928921988 in words is "two hundred twelve billion, nine hundred twenty-eight million, nine hundred twenty-one thousand, nine hundred eighty-eight".