22156220461 has 6 divisors (see below), whose sum is σ = 22709798186. Its totient is φ = 21615823200.

The previous prime is 22156220369. The next prime is 22156220477. The reversal of 22156220461 is 16402265122.

It can be written as a sum of positive squares in 3 ways, for example, as 918696100 + 21237524361 = 30310^2 + 145731^2 .

It is not a de Polignac number, because 22156220461 - 2⁹ = 22156219949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22156220861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6588510 + ... + 6591871.

Almost surely, 2^22156220461 is an apocalyptic number.

It is an amenable number.

22156220461 is a deficient number, since it is larger than the sum of its proper divisors (553577725).

22156220461 is an equidigital number, since it uses as much as digits as its factorization.

22156220461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13180463 (or 13180422 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 22156220461 its reverse (16402265122), we get a palindrome (38558485583).

The spelling of 22156220461 in words is "twenty-two billion, one hundred fifty-six million, two hundred twenty thousand, four hundred sixty-one".