1222255223521 has 2 divisors, whose sum is σ = 1222255223522. Its totient is φ = 1222255223520.

The previous prime is 1222255223471. The next prime is 1222255223543. The reversal of 1222255223521 is 1253225522221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743197443921 + 479057779600 = 862089^2 + 692140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222255223521 - 2¹⁵ = 1222255190753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222255223561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611127611760 + 611127611761.

It is an arithmetic number, because the mean of its divisors is an integer number (611127611761).

Almost surely, 2^{1222255223521} is an apocalyptic number.

It is an amenable number.

1222255223521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222255223521 is an equidigital number, since it uses as much as digits as its factorization.

1222255223521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 34.

The spelling of 1222255223521 in words is "one trillion, two hundred twenty-two billion, two hundred fifty-five million, two hundred twenty-three thousand, five hundred twenty-one".