1221942527231 has 2 divisors, whose sum is σ = 1221942527232. Its totient is φ = 1221942527230.

The previous prime is 1221942527173. The next prime is 1221942527243. The reversal of 1221942527231 is 1327252491221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221942527231 - 2³⁰ = 1220868785407 is a prime.

It is a super-2 number, since 2×1221942527231² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221942527431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610971263615 + 610971263616.

It is an arithmetic number, because the mean of its divisors is an integer number (610971263616).

Almost surely, 2^{1221942527231} is an apocalyptic number.

1221942527231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221942527231 is an equidigital number, since it uses as much as digits as its factorization.

1221942527231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The spelling of 1221942527231 in words is "one trillion, two hundred twenty-one billion, nine hundred forty-two million, five hundred twenty-seven thousand, two hundred thirty-one".