1221112199927 has 2 divisors, whose sum is σ = 1221112199928. Its totient is φ = 1221112199926.

The previous prime is 1221112199899. The next prime is 1221112200037. The reversal of 1221112199927 is 7299912111221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221112199927 - 2¹⁰ = 1221112198903 is a prime.

It is a super-2 number, since 2×1221112199927² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221112199327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610556099963 + 610556099964.

It is an arithmetic number, because the mean of its divisors is an integer number (610556099964).

Almost surely, 2^{1221112199927} is an apocalyptic number.

1221112199927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221112199927 is an equidigital number, since it uses as much as digits as its factorization.

1221112199927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 47.

The spelling of 1221112199927 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred ninety-nine thousand, nine hundred twenty-seven".