212356620505 has 8 divisors (see below), whose sum is σ = 254899930824. Its totient is φ = 169837305600.

The previous prime is 212356620493. The next prime is 212356620547. The reversal of 212356620505 is 505026653212.

It can be written as a sum of positive squares in 4 ways, for example, as 22202192016 + 190154428489 = 149004^2 + 436067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212356620505 - 2³⁵ = 177996882137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5979376 + ... + 6014785.

It is an arithmetic number, because the mean of its divisors is an integer number (31862491353).

Almost surely, 2^212356620505 is an apocalyptic number.

It is an amenable number.

212356620505 is a deficient number, since it is larger than the sum of its proper divisors (42543310319).

212356620505 is a wasteful number, since it uses less digits than its factorization.

212356620505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11997707.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 212356620505 in words is "two hundred twelve billion, three hundred fifty-six million, six hundred twenty thousand, five hundred five".