21724642712 has 32 divisors (see below), whose sum is σ = 43080859200. Its totient is φ = 10241834400.

The previous prime is 21724642711. The next prime is 21724642729.

21724642712 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21724642711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306614 + ... + 370757.

It is an arithmetic number, because the mean of its divisors is an integer number (1346276850).

Almost surely, 2^21724642712 is an apocalyptic number.

It is an amenable number.

21724642712 is a deficient number, since it is larger than the sum of its proper divisors (21356216488).

21724642712 is a wasteful number, since it uses less digits than its factorization.

21724642712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677607 (or 677603 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The spelling of 21724642712 in words is "twenty-one billion, seven hundred twenty-four million, six hundred forty-two thousand, seven hundred twelve".