22128501 has 4 divisors (see below), whose sum is σ = 29504672. Its totient is φ = 14752332.

The previous prime is 22128487. The next prime is 22128503. The reversal of 22128501 is 10582122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22128501 - 2¹⁰ = 22127477 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 (22128503) 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, 3688081 + ... + 3688086.

It is an arithmetic number, because the mean of its divisors is an integer number (7376168).

Almost surely, 2^22128501 is an apocalyptic number.

It is an amenable number.

22128501 is a deficient number, since it is larger than the sum of its proper divisors (7376171).

22128501 is an equidigital number, since it uses as much as digits as its factorization.

22128501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376170.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 22128501 is about 4704.0940679370. The cubic root of 22128501 is about 280.7484271280.

The spelling of 22128501 in words is "twenty-two million, one hundred twenty-eight thousand, five hundred one".