212286339978 has 32 divisors (see below), whose sum is σ = 449036759040. Its totient is φ = 66720069360.

The previous prime is 212286339953. The next prime is 212286339989. The reversal of 212286339978 is 879933682212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4388650 + ... + 4436757.

It is an arithmetic number, because the mean of its divisors is an integer number (14032398720).

Almost surely, 2^212286339978 is an apocalyptic number.

212286339978 is an abundant number, since it is smaller than the sum of its proper divisors (236750419062).

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

212286339978 is a wasteful number, since it uses less digits than its factorization.

212286339978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8825642.

The product of its digits is 15676416, while the sum is 60.

The spelling of 212286339978 in words is "two hundred twelve billion, two hundred eighty-six million, three hundred thirty-nine thousand, nine hundred seventy-eight".