21629642731634 has 32 divisors (see below), whose sum is σ = 37110262275072. Its totient is φ = 9262129050000.

The previous prime is 21629642731633. The next prime is 21629642731673. The reversal of 21629642731634 is 43613724692612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21629642731634.

It is not an unprimeable number, because it can be changed into a prime (21629642731633) 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, 573848729 + ... + 573886419.

It is an arithmetic number, because the mean of its divisors is an integer number (1159695696096).

Almost surely, 2^{21629642731634} is an apocalyptic number.

21629642731634 is a deficient number, since it is larger than the sum of its proper divisors (15480619543438).

21629642731634 is a wasteful number, since it uses less digits than its factorization.

21629642731634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70742.

The product of its digits is 15676416, while the sum is 56.

The spelling of 21629642731634 in words is "twenty-one trillion, six hundred twenty-nine billion, six hundred forty-two million, seven hundred thirty-one thousand, six hundred thirty-four".