1221963892267 has 2 divisors, whose sum is σ = 1221963892268. Its totient is φ = 1221963892266.

The previous prime is 1221963892241. The next prime is 1221963892301. The reversal of 1221963892267 is 7622983691221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221963892267 - 2³⁹ = 672208078379 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221963892067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610981946133 + 610981946134.

It is an arithmetic number, because the mean of its divisors is an integer number (610981946134).

Almost surely, 2^{1221963892267} is an apocalyptic number.

1221963892267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221963892267 is an equidigital number, since it uses as much as digits as its factorization.

1221963892267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 58.

The spelling of 1221963892267 in words is "one trillion, two hundred twenty-one billion, nine hundred sixty-three million, eight hundred ninety-two thousand, two hundred sixty-seven".