212905139112 has 48 divisors (see below), whose sum is σ = 579951171540. Its totient is φ = 70558153728.

The previous prime is 212905139089. The next prime is 212905139131. The reversal of 212905139112 is 211931509212.

212905139112 is a `hidden beast` number, since 2 + 1 + 29 + 0 + 513 + 9 + 112 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 211116356676 + 1788782436 = 459474^2 + 42294^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8533833 + ... + 8558744.

Almost surely, 2^212905139112 is an apocalyptic number.

It is an amenable number.

212905139112 is an abundant number, since it is smaller than the sum of its proper divisors (367046032428).

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

212905139112 is a wasteful number, since it uses less digits than its factorization.

212905139112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17092762 (or 17092755 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 212905139112 in words is "two hundred twelve billion, nine hundred five million, one hundred thirty-nine thousand, one hundred twelve".