21722467751 has 16 divisors (see below), whose sum is σ = 22402725504. Its totient is φ = 21047330304.

The previous prime is 21722467733. The next prime is 21722467771. The reversal of 21722467751 is 15776422712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21722467751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722467771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11596751 + ... + 11598623.

It is an arithmetic number, because the mean of its divisors is an integer number (1400170344).

Almost surely, 2^21722467751 is an apocalyptic number.

21722467751 is a deficient number, since it is larger than the sum of its proper divisors (680257753).

21722467751 is a wasteful number, since it uses less digits than its factorization.

21722467751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3050.

The product of its digits is 329280, while the sum is 44.

The spelling of 21722467751 in words is "twenty-one billion, seven hundred twenty-two million, four hundred sixty-seven thousand, seven hundred fifty-one".