22155530521 has 2 divisors, whose sum is σ = 22155530522. Its totient is φ = 22155530520.

The previous prime is 22155530491. The next prime is 22155530533. The reversal of 22155530521 is 12503555122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18867769600 + 3287760921 = 137360^2 + 57339^2 .

It is a cyclic number.

It is not a de Polignac number, because 22155530521 - 2⁵ = 22155530489 is a prime.

It is not a weakly prime, because it can be changed into another prime (22155530591) by changing a digit.

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 as a sum of consecutive naturals, namely, 11077765260 + 11077765261.

It is an arithmetic number, because the mean of its divisors is an integer number (11077765261).

Almost surely, 2^22155530521 is an apocalyptic number.

It is an amenable number.

22155530521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22155530521 is an equidigital number, since it uses as much as digits as its factorization.

22155530521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 22155530521 in words is "twenty-two billion, one hundred fifty-five million, five hundred thirty thousand, five hundred twenty-one".