22521398 has 4 divisors (see below), whose sum is σ = 33782100. Its totient is φ = 11260698.

The previous prime is 22521397. The next prime is 22521409. The reversal of 22521398 is 89312522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5630348 + ... + 5630351.

It is an arithmetic number, because the mean of its divisors is an integer number (8445525).

Almost surely, 2^22521398 is an apocalyptic number.

22521398 is a deficient number, since it is larger than the sum of its proper divisors (11260702).

22521398 is a wasteful number, since it uses less digits than its factorization.

22521398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11260701.

The product of its digits is 8640, while the sum is 32.

The square root of 22521398 is about 4745.6715014843. The cubic root of 22521398 is about 282.4002749264.

The spelling of 22521398 in words is "twenty-two million, five hundred twenty-one thousand, three hundred ninety-eight".