22621557 has 16 divisors (see below), whose sum is σ = 34537472. Its totient is φ = 12901680.

The previous prime is 22621553. The next prime is 22621559. The reversal of 22621557 is 75512622.

It is not a de Polignac number, because 22621557 - 2² = 22621553 is a prime.

It is a super-2 number, since 2×22621557² = 1023469682208498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22621553) 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, 20268 + ... + 21354.

It is an arithmetic number, because the mean of its divisors is an integer number (2158592).

Almost surely, 2^22621557 is an apocalyptic number.

It is an amenable number.

22621557 is a deficient number, since it is larger than the sum of its proper divisors (11915915).

22621557 is a wasteful number, since it uses less digits than its factorization.

22621557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088.

The product of its digits is 8400, while the sum is 30.

The square root of 22621557 is about 4756.2124637152. The cubic root of 22621557 is about 282.8182937083.

The spelling of 22621557 in words is "twenty-two million, six hundred twenty-one thousand, five hundred fifty-seven".