22156220425 has 6 divisors (see below), whose sum is σ = 27473713358. Its totient is φ = 17724976320.

The previous prime is 22156220369. The next prime is 22156220477. The reversal of 22156220425 is 52402265122.

It can be written as a sum of positive squares in 3 ways, for example, as 1040643081 + 21115577344 = 32259^2 + 145312^2 .

It is not a de Polignac number, because 22156220425 - 2¹⁵ = 22156187657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 443124384 + ... + 443124433.

Almost surely, 2^22156220425 is an apocalyptic number.

22156220425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22156220425 is a deficient number, since it is larger than the sum of its proper divisors (5317492933).

22156220425 is an equidigital number, since it uses as much as digits as its factorization.

22156220425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886248827 (or 886248822 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 22156220425 its reverse (52402265122), we get a palindrome (74558485547).

The spelling of 22156220425 in words is "twenty-two billion, one hundred fifty-six million, two hundred twenty thousand, four hundred twenty-five".