22721631 has 8 divisors (see below), whose sum is σ = 31612800. Its totient is φ = 14489112.

The previous prime is 22721617. The next prime is 22721651. The reversal of 22721631 is 13612722.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22721631 - 2¹¹ = 22719583 is a prime.

It is a super-2 number, since 2×22721631² = 1032545030600322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164581 + ... + 164718.

It is an arithmetic number, because the mean of its divisors is an integer number (3951600).

Almost surely, 2^22721631 is an apocalyptic number.

22721631 is a deficient number, since it is larger than the sum of its proper divisors (8891169).

22721631 is a wasteful number, since it uses less digits than its factorization.

22721631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329325.

The product of its digits is 1008, while the sum is 24.

The square root of 22721631 is about 4766.7212001543. The cubic root of 22721631 is about 283.2347272402.

The spelling of 22721631 in words is "twenty-two million, seven hundred twenty-one thousand, six hundred thirty-one".