22860721 has 8 divisors (see below), whose sum is σ = 24683624. Its totient is φ = 21047040.

The previous prime is 22860703. The next prime is 22860727. The reversal of 22860721 is 12706822.

It can be written as a sum of positive squares in 4 ways, for example, as 193600 + 22667121 = 440^2 + 4761^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22860721 - 2¹⁵ = 22827953 is a prime.

It is a super-2 number, since 2×22860721² = 1045225129279682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22860721.

It is not an unprimeable number, because it can be changed into a prime (22860727) 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, 3385 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (3085453).

Almost surely, 2^22860721 is an apocalyptic number.

It is an amenable number.

22860721 is a deficient number, since it is larger than the sum of its proper divisors (1822903).

22860721 is a wasteful number, since it uses less digits than its factorization.

22860721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4611.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 22860721 is about 4781.2886338308. The cubic root of 22860721 is about 283.8114904870.

The spelling of 22860721 in words is "twenty-two million, eight hundred sixty thousand, seven hundred twenty-one".