21629642731672 has 64 divisors (see below), whose sum is σ = 42064042996800. Its totient is φ = 10414551114240.

The previous prime is 21629642731633. The next prime is 21629642731673. The reversal of 21629642731672 is 27613724692612.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629642731673) 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, 157972522 + ... + 158109382.

It is an arithmetic number, because the mean of its divisors is an integer number (657250671825).

Almost surely, 2^{21629642731672} is an apocalyptic number.

It is an amenable number.

21629642731672 is a deficient number, since it is larger than the sum of its proper divisors (20434400265128).

21629642731672 is a wasteful number, since it uses less digits than its factorization.

21629642731672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138676 (or 138672 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 58.

The spelling of 21629642731672 in words is "twenty-one trillion, six hundred twenty-nine billion, six hundred forty-two million, seven hundred thirty-one thousand, six hundred seventy-two".