212356441605 has 128 divisors (see below), whose sum is σ = 435358457856. Its totient is φ = 85818470400.

The previous prime is 212356441597. The next prime is 212356441663. The reversal of 212356441605 is 506144653212.

It is not a de Polignac number, because 212356441605 - 2³ = 212356441597 is a prime.

It is a super-2 number, since 2×212356441605² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14814952 + ... + 14829278.

It is an arithmetic number, because the mean of its divisors is an integer number (3401237952).

Almost surely, 2^212356441605 is an apocalyptic number.

It is an amenable number.

212356441605 is an abundant number, since it is smaller than the sum of its proper divisors (223002016251).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212356441605 is a wasteful number, since it uses less digits than its factorization.

212356441605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14707.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 212356441605 in words is "two hundred twelve billion, three hundred fifty-six million, four hundred forty-one thousand, six hundred five".