22721697 has 24 divisors (see below), whose sum is σ = 33572864. Its totient is φ = 14805504.

The previous prime is 22721689. The next prime is 22721717. The reversal of 22721697 is 79612722.

It is not a de Polignac number, because 22721697 - 2³ = 22721689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22721617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117633 + ... + 117825.

Almost surely, 2^22721697 is an apocalyptic number.

It is an amenable number.

22721697 is a deficient number, since it is larger than the sum of its proper divisors (10851167).

22721697 is a wasteful number, since it uses less digits than its factorization.

22721697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 426 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 22721697 is about 4766.7281231469. The cubic root of 22721697 is about 283.2350014792.

It can be divided in two parts, 2272 and 1697, that added together give a square (3969 = 63²).

The spelling of 22721697 in words is "twenty-two million, seven hundred twenty-one thousand, six hundred ninety-seven".