22500421 has 4 divisors (see below), whose sum is σ = 22535532. Its totient is φ = 22465312.

The previous prime is 22500419. The next prime is 22500437. The reversal of 22500421 is 12400522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12400522 = 2 ⋅6200261.

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 12859396 = 3105^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 22500421 - 2¹ = 22500419 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 22500395 and 22500404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22500721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16576 + ... + 17881.

It is an arithmetic number, because the mean of its divisors is an integer number (5633883).

Almost surely, 2^22500421 is an apocalyptic number.

It is an amenable number.

22500421 is a deficient number, since it is larger than the sum of its proper divisors (35111).

22500421 is an equidigital number, since it uses as much as digits as its factorization.

22500421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35110.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22500421 is about 4743.4608673415. The cubic root of 22500421 is about 282.3125694363.

Adding to 22500421 its reverse (12400522), we get a palindrome (34900943).

The spelling of 22500421 in words is "twenty-two million, five hundred thousand, four hundred twenty-one".