212758474891 has 4 divisors (see below), whose sum is σ = 216772785792. Its totient is φ = 208744163992.

The previous prime is 212758474861. The next prime is 212758474897. The reversal of 212758474891 is 198474857212.

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

It is a cyclic number.

It is not a de Polignac number, because 212758474891 - 2¹³ = 212758466699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212758474897) 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, 2007155371 + ... + 2007155476.

It is an arithmetic number, because the mean of its divisors is an integer number (54193196448).

Almost surely, 2^212758474891 is an apocalyptic number.

212758474891 is a deficient number, since it is larger than the sum of its proper divisors (4014310901).

212758474891 is an equidigital number, since it uses as much as digits as its factorization.

212758474891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014310900.

The product of its digits is 9031680, while the sum is 58.

The spelling of 212758474891 in words is "two hundred twelve billion, seven hundred fifty-eight million, four hundred seventy-four thousand, eight hundred ninety-one".