22125404561 has 4 divisors (see below), whose sum is σ = 23827358772. Its totient is φ = 20423450352.

The previous prime is 22125404557. The next prime is 22125404597. The reversal of 22125404561 is 16540452122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12932238400 + 9193166161 = 113720^2 + 95881^2 .

It is a cyclic number.

It is not a de Polignac number, because 22125404561 - 2² = 22125404557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22125404501) 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, 850977086 + ... + 850977111.

It is an arithmetic number, because the mean of its divisors is an integer number (5956839693).

Almost surely, 2^22125404561 is an apocalyptic number.

It is an amenable number.

22125404561 is a deficient number, since it is larger than the sum of its proper divisors (1701954211).

22125404561 is a wasteful number, since it uses less digits than its factorization.

22125404561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701954210.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 22125404561 its reverse (16540452122), we get a palindrome (38665856683).

The spelling of 22125404561 in words is "twenty-two billion, one hundred twenty-five million, four hundred four thousand, five hundred sixty-one".