22123557 has 8 divisors (see below), whose sum is σ = 32775680. Its totient is φ = 14749020.

The previous prime is 22123547. The next prime is 22123603. The reversal of 22123557 is 75532122.

It is not a de Polignac number, because 22123557 - 2¹⁰ = 22122533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 819391 = 22123557 / (2 + 2 + 1 + 2 + 3 + 5 + 5 + 7).

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 22123557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22123547) 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, 409669 + ... + 409722.

It is an arithmetic number, because the mean of its divisors is an integer number (4096960).

Almost surely, 2^22123557 is an apocalyptic number.

22123557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

22123557 is a deficient number, since it is larger than the sum of its proper divisors (10652123).

22123557 is an equidigital number, since it uses as much as digits as its factorization.

22123557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819400 (or 819394 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 22123557 is about 4703.5685388862. The cubic root of 22123557 is about 280.7275170868.

Adding to 22123557 its reverse (75532122), we get a palindrome (97655679).

The spelling of 22123557 in words is "twenty-two million, one hundred twenty-three thousand, five hundred fifty-seven".