212312128 has 28 divisors (see below), whose sum is σ = 481494592. Its totient is φ = 90990720.

The previous prime is 212312119. The next prime is 212312129. The reversal of 212312128 is 821213212.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 212312099 and 212312108.

It is not an unprimeable number, because it can be changed into a prime (212312129) 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, 236508 + ... + 237403.

Almost surely, 2^212312128 is an apocalyptic number.

212312128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

212312128 is an abundant number, since it is smaller than the sum of its proper divisors (269182464).

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

212312128 is an equidigital number, since it uses as much as digits as its factorization.

212312128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473930 (or 473920 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 212312128 is about 14570.9343557646. The cubic root of 212312128 is about 596.5656836615.

The spelling of 212312128 in words is "two hundred twelve million, three hundred twelve thousand, one hundred twenty-eight".