212377988691 has 64 divisors (see below), whose sum is σ = 354650849280. Its totient is φ = 124441812000.

The previous prime is 212377988681. The next prime is 212377988759. The reversal of 212377988691 is 196889773212.

212377988691 is a `hidden beast` number, since 2 + 12 + 377 + 98 + 86 + 91 = 666.

It is not a de Polignac number, because 212377988691 - 2⁵ = 212377988659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212377988681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10034266 + ... + 10055408.

It is an arithmetic number, because the mean of its divisors is an integer number (5541419520).

Almost surely, 2^212377988691 is an apocalyptic number.

212377988691 is a deficient number, since it is larger than the sum of its proper divisors (142272860589).

212377988691 is a wasteful number, since it uses less digits than its factorization.

212377988691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22285 (or 22279 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 212377988691 in words is "two hundred twelve billion, three hundred seventy-seven million, nine hundred eighty-eight thousand, six hundred ninety-one".