22501423 has 4 divisors (see below), whose sum is σ = 25715920. Its totient is φ = 19286928.

The previous prime is 22501403. The next prime is 22501441. The reversal of 22501423 is 32410522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32410522 = 2 ⋅16205261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22501423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22501423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22501403) 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, 1607238 + ... + 1607251.

It is an arithmetic number, because the mean of its divisors is an integer number (6428980).

Almost surely, 2^22501423 is an apocalyptic number.

22501423 is a deficient number, since it is larger than the sum of its proper divisors (3214497).

22501423 is an equidigital number, since it uses as much as digits as its factorization.

22501423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214496.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22501423 is about 4743.5664852514. The cubic root of 22501423 is about 282.3167600689.

Adding to 22501423 its reverse (32410522), we get a palindrome (54911945).

Subtracting 22501423 from its reverse (32410522), we obtain a palindrome (9909099).

The spelling of 22501423 in words is "twenty-two million, five hundred one thousand, four hundred twenty-three".