22521421 has 8 divisors (see below), whose sum is σ = 24665760. Its totient is φ = 20435952.

The previous prime is 22521409. The next prime is 22521431. The reversal of 22521421 is 12412522.

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 22521421 - 2²³ = 14132813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521431) 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, 13915 + ... + 15448.

It is an arithmetic number, because the mean of its divisors is an integer number (3083220).

Almost surely, 2^22521421 is an apocalyptic number.

It is an amenable number.

22521421 is a deficient number, since it is larger than the sum of its proper divisors (2144339).

22521421 is a wasteful number, since it uses less digits than its factorization.

22521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29435.

The product of its digits is 320, while the sum is 19.

The square root of 22521421 is about 4745.6739247445. The cubic root of 22521421 is about 282.4003710602.

Adding to 22521421 its reverse (12412522), we get a palindrome (34933943).

The spelling of 22521421 in words is "twenty-two million, five hundred twenty-one thousand, four hundred twenty-one".