212787474178 has 4 divisors (see below), whose sum is σ = 319181211270. Its totient is φ = 106393737088.

The previous prime is 212787474127. The next prime is 212787474203. The reversal of 212787474178 is 871474787212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 163493261649 + 49294212529 = 404343^2 + 222023^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53196868543 + ... + 53196868546.

Almost surely, 2^212787474178 is an apocalyptic number.

212787474178 is a deficient number, since it is larger than the sum of its proper divisors (106393737092).

212787474178 is a wasteful number, since it uses less digits than its factorization.

212787474178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106393737091.

The product of its digits is 9834496, while the sum is 58.

The spelling of 212787474178 in words is "two hundred twelve billion, seven hundred eighty-seven million, four hundred seventy-four thousand, one hundred seventy-eight".