212639235631 has 4 divisors (see below), whose sum is σ = 212805491200. Its totient is φ = 212472980064.

The previous prime is 212639235617. The next prime is 212639235637. The reversal of 212639235631 is 136532936212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212639235631 - 2¹⁹ = 212638711343 is a prime.

It is a super-2 number, since 2×212639235631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212639235637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83125866 + ... + 83128423.

It is an arithmetic number, because the mean of its divisors is an integer number (53201372800).

Almost surely, 2^212639235631 is an apocalyptic number.

212639235631 is a deficient number, since it is larger than the sum of its proper divisors (166255569).

212639235631 is a wasteful number, since it uses less digits than its factorization.

212639235631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166255568.

The product of its digits is 349920, while the sum is 43.

The spelling of 212639235631 in words is "two hundred twelve billion, six hundred thirty-nine million, two hundred thirty-five thousand, six hundred thirty-one".