2181324637631 has 16 divisors (see below), whose sum is σ = 2203700428800. Its totient is φ = 2159077737600.

The previous prime is 2181324637607. The next prime is 2181324637633. The reversal of 2181324637631 is 1367364231812.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2181324637631 is a prime.

It is a super-2 number, since 2×2181324637631² (a number of 25 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 (2181324637633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58366391 + ... + 58403751.

It is an arithmetic number, because the mean of its divisors is an integer number (137731276800).

Almost surely, 2^{2181324637631} is an apocalyptic number.

2181324637631 is a deficient number, since it is larger than the sum of its proper divisors (22375791169).

2181324637631 is a wasteful number, since it uses less digits than its factorization.

2181324637631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39070.

The product of its digits is 870912, while the sum is 47.

The spelling of 2181324637631 in words is "two trillion, one hundred eighty-one billion, three hundred twenty-four million, six hundred thirty-seven thousand, six hundred thirty-one".