212630403681 has 12 divisors (see below), whose sum is σ = 307582496208. Its totient is φ = 141546052824.

The previous prime is 212630403659. The next prime is 212630403691. The reversal of 212630403681 is 186304036212.

212630403681 is a `hidden beast` number, since 2 + 12 + 630 + 4 + 0 + 3 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 212630403681 - 2²⁶ = 212563294817 is a prime.

It is a super-2 number, since 2×212630403681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212630403691) 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, 17289315 + ... + 17301608.

It is an arithmetic number, because the mean of its divisors is an integer number (25631874684).

Almost surely, 2^212630403681 is an apocalyptic number.

It is an amenable number.

212630403681 is a deficient number, since it is larger than the sum of its proper divisors (94952092527).

212630403681 is a wasteful number, since it uses less digits than its factorization.

212630403681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34591612 (or 34591609 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 212630403681 its reverse (186304036212), we get a palindrome (398934439893).

The spelling of 212630403681 in words is "two hundred twelve billion, six hundred thirty million, four hundred three thousand, six hundred eighty-one".