22125561 has 4 divisors (see below), whose sum is σ = 29500752. Its totient is φ = 14750372.

The previous prime is 22125541. The next prime is 22125589. The reversal of 22125561 is 16552122.

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 a cyclic number.

It is not a de Polignac number, because 22125561 - 2¹³ = 22117369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22125511) 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, 3687591 + ... + 3687596.

It is an arithmetic number, because the mean of its divisors is an integer number (7375188).

Almost surely, 2^22125561 is an apocalyptic number.

It is an amenable number.

22125561 is a deficient number, since it is larger than the sum of its proper divisors (7375191).

22125561 is an equidigital number, since it uses as much as digits as its factorization.

22125561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7375190.

The product of its digits is 1200, while the sum is 24.

The square root of 22125561 is about 4703.7815638059. The cubic root of 22125561 is about 280.7359931342.

Adding to 22125561 its reverse (16552122), we get a palindrome (38677683).

The spelling of 22125561 in words is "twenty-two million, one hundred twenty-five thousand, five hundred sixty-one".