1221693950963 has 2 divisors, whose sum is σ = 1221693950964. Its totient is φ = 1221693950962.

The previous prime is 1221693950957. The next prime is 1221693951031. The reversal of 1221693950963 is 3690593961221.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3690593961221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221693950963 - 2³⁴ = 1204514081779 is a prime.

It is a super-2 number, since 2×1221693950963² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221693950899 and 1221693950908.

It is not a weakly prime, because it can be changed into another prime (1221693920963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610846975481 + 610846975482.

It is an arithmetic number, because the mean of its divisors is an integer number (610846975482).

Almost surely, 2^{1221693950963} is an apocalyptic number.

1221693950963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221693950963 is an equidigital number, since it uses as much as digits as its factorization.

1221693950963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4723920, while the sum is 56.

The spelling of 1221693950963 in words is "one trillion, two hundred twenty-one billion, six hundred ninety-three million, nine hundred fifty thousand, nine hundred sixty-three".