22154521 has 8 divisors (see below), whose sum is σ = 23011200. Its totient is φ = 21304080.

The previous prime is 22154501. The next prime is 22154533. The reversal of 22154521 is 12545122.

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 22154521 - 2⁷ = 22154393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22154492 and 22154501.

It is not an unprimeable number, because it can be changed into a prime (22154501) 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, 6450 + ... + 9268.

It is an arithmetic number, because the mean of its divisors is an integer number (2876400).

Almost surely, 2^22154521 is an apocalyptic number.

It is an amenable number.

22154521 is a deficient number, since it is larger than the sum of its proper divisors (856679).

22154521 is a wasteful number, since it uses less digits than its factorization.

22154521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its digits is 800, while the sum is 22.

The square root of 22154521 is about 4706.8589313894. The cubic root of 22154521 is about 280.8584242263.

Adding to 22154521 its reverse (12545122), we get a palindrome (34699643).

The spelling of 22154521 in words is "twenty-two million, one hundred fifty-four thousand, five hundred twenty-one".