22529421 has 20 divisors (see below), whose sum is σ = 35428800. Its totient is φ = 14228136.

The previous prime is 22529413. The next prime is 22529431. The reversal of 22529421 is 12492522.

It is a happy number.

It is not a de Polignac number, because 22529421 - 2³ = 22529413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22529431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5781 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (1771440).

Almost surely, 2^22529421 is an apocalyptic number.

It is an amenable number.

22529421 is a deficient number, since it is larger than the sum of its proper divisors (12899379).

22529421 is a wasteful number, since it uses less digits than its factorization.

22529421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14670 (or 14661 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 22529421 is about 4746.5167228190. The cubic root of 22529421 is about 282.4338049410.

It can be divided in two parts, 225 and 29421, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 22529421 in words is "twenty-two million, five hundred twenty-nine thousand, four hundred twenty-one".