212669556706621 has 18 divisors (see below), whose sum is σ = 249183714563550. Its totient is φ = 180976764819312.

The previous prime is 212669556706619. The next prime is 212669556706699. The reversal of 212669556706621 is 126607655966212.

It can be written as a sum of positive squares in only one way, i.e., 153733688325721 + 58935868380900 = 12398939^2 + 7676970^2 .

It is not a de Polignac number, because 212669556706621 - 2¹ = 212669556706619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212669556706121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 111371346 + ... + 113264803.

It is an arithmetic number, because the mean of its divisors is an integer number (13843539697975).

Almost surely, 2^{212669556706621} is an apocalyptic number.

It is an amenable number.

212669556706621 is a deficient number, since it is larger than the sum of its proper divisors (36514157856929).

212669556706621 is an equidigital number, since it uses as much as digits as its factorization.

212669556706621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224636441 (or 224636295 counting only the distinct ones).

The product of its (nonzero) digits is 97977600, while the sum is 64.

The spelling of 212669556706621 in words is "two hundred twelve trillion, six hundred sixty-nine billion, five hundred fifty-six million, seven hundred six thousand, six hundred twenty-one".