212972278 has 4 divisors (see below), whose sum is σ = 319458420. Its totient is φ = 106486138.

The previous prime is 212972267. The next prime is 212972293. The reversal of 212972278 is 872279212.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 212972278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53243068 + ... + 53243071.

It is an arithmetic number, because the mean of its divisors is an integer number (79864605).

Almost surely, 2^212972278 is an apocalyptic number.

212972278 is a deficient number, since it is larger than the sum of its proper divisors (106486142).

212972278 is a wasteful number, since it uses less digits than its factorization.

212972278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106486141.

The product of its digits is 56448, while the sum is 40.

The square root of 212972278 is about 14593.5697483515. The cubic root of 212972278 is about 597.1833518833.

The spelling of 212972278 in words is "two hundred twelve million, nine hundred seventy-two thousand, two hundred seventy-eight".