212407716721 has 4 divisors (see below), whose sum is σ = 212866481152. Its totient is φ = 211948952292.

The previous prime is 212407716659. The next prime is 212407716767. The reversal of 212407716721 is 127617704212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212407716721 - 2²⁵ = 212374162289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212407416721) 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, 229381521 + ... + 229382446.

It is an arithmetic number, because the mean of its divisors is an integer number (53216620288).

Almost surely, 2^212407716721 is an apocalyptic number.

It is an amenable number.

212407716721 is a deficient number, since it is larger than the sum of its proper divisors (458764431).

212407716721 is an equidigital number, since it uses as much as digits as its factorization.

212407716721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458764430.

The product of its (nonzero) digits is 65856, while the sum is 40.

The spelling of 212407716721 in words is "two hundred twelve billion, four hundred seven million, seven hundred sixteen thousand, seven hundred twenty-one".