22287921 has 16 divisors (see below), whose sum is σ = 30898560. Its totient is φ = 14273280.

The previous prime is 22287871. The next prime is 22287929. The reversal of 22287921 is 12978222.

It is not a de Polignac number, because 22287921 - 2⁶ = 22287857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22287929) 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, 20436 + ... + 21498.

It is an arithmetic number, because the mean of its divisors is an integer number (1931160).

Almost surely, 2^22287921 is an apocalyptic number.

It is an amenable number.

22287921 is a deficient number, since it is larger than the sum of its proper divisors (8610639).

22287921 is a wasteful number, since it uses less digits than its factorization.

22287921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its digits is 8064, while the sum is 33.

The square root of 22287921 is about 4721.0084727736. The cubic root of 22287921 is about 281.4210116511.

The spelling of 22287921 in words is "twenty-two million, two hundred eighty-seven thousand, nine hundred twenty-one".