212215891644 has 36 divisors (see below), whose sum is σ = 553738960320. Its totient is φ = 68456738880.

The previous prime is 212215891627. The next prime is 212215891649. The reversal of 212215891644 is 446198512212.

212215891644 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 589 + 1 + 64 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 212215891644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212215891649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95077689 + ... + 95079920.

Almost surely, 2^212215891644 is an apocalyptic number.

It is an amenable number.

212215891644 is an abundant number, since it is smaller than the sum of its proper divisors (341523068676).

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

212215891644 is a wasteful number, since it uses less digits than its factorization.

212215891644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190157650 (or 190157645 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 212215891644 in words is "two hundred twelve billion, two hundred fifteen million, eight hundred ninety-one thousand, six hundred forty-four".