212071492865 has 4 divisors (see below), whose sum is σ = 254485791444. Its totient is φ = 169657194288.

The previous prime is 212071492817. The next prime is 212071492889. The reversal of 212071492865 is 568294170212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23429812624 + 188641680241 = 153068^2 + 434329^2 .

It is a cyclic number.

It is not a de Polignac number, because 212071492865 - 2¹⁴ = 212071476481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21207149282 + ... + 21207149291.

It is an arithmetic number, because the mean of its divisors is an integer number (63621447861).

Almost surely, 2^212071492865 is an apocalyptic number.

It is an amenable number.

212071492865 is a deficient number, since it is larger than the sum of its proper divisors (42414298579).

212071492865 is an equidigital number, since it uses as much as digits as its factorization.

212071492865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42414298578.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 212071492865 in words is "two hundred twelve billion, seventy-one million, four hundred ninety-two thousand, eight hundred sixty-five".