1221020111963 has 2 divisors, whose sum is σ = 1221020111964. Its totient is φ = 1221020111962.

The previous prime is 1221020111959. The next prime is 1221020112017. The reversal of 1221020111963 is 3691110201221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221020111963 - 2² = 1221020111959 is a prime.

It is a super-2 number, since 2×1221020111963² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221020141963) 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, 610510055981 + 610510055982.

It is an arithmetic number, because the mean of its divisors is an integer number (610510055982).

Almost surely, 2^{1221020111963} is an apocalyptic number.

1221020111963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020111963 is an equidigital number, since it uses as much as digits as its factorization.

1221020111963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 1221020111963 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred eleven thousand, nine hundred sixty-three".