1221693951031 has 2 divisors, whose sum is σ = 1221693951032. Its totient is φ = 1221693951030.

The previous prime is 1221693950963. The next prime is 1221693951041. The reversal of 1221693951031 is 1301593961221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1301593961221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221693951031 - 2¹³ = 1221693942839 is a prime.

It is a super-2 number, since 2×1221693951031² (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 (1221693951041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610846975515 + 610846975516.

It is an arithmetic number, because the mean of its divisors is an integer number (610846975516).

Almost surely, 2^{1221693951031} is an apocalyptic number.

1221693951031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221693951031 is an equidigital number, since it uses as much as digits as its factorization.

1221693951031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 1221693951031 in words is "one trillion, two hundred twenty-one billion, six hundred ninety-three million, nine hundred fifty-one thousand, thirty-one".