1221014451961 has 2 divisors, whose sum is σ = 1221014451962. Its totient is φ = 1221014451960.

The previous prime is 1221014451949. The next prime is 1221014451973. The reversal of 1221014451961 is 1691544101221.

It is a balanced prime because it is at equal distance from previous prime (1221014451949) and next prime (1221014451973).

It can be written as a sum of positive squares in only one way, i.e., 1193460111936 + 27554340025 = 1092456^2 + 165995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221014451961 - 2⁵ = 1221014451929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221014451961.

It is not a weakly prime, because it can be changed into another prime (1221014451911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610507225980 + 610507225981.

It is an arithmetic number, because the mean of its divisors is an integer number (610507225981).

Almost surely, 2^{1221014451961} is an apocalyptic number.

It is an amenable number.

1221014451961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221014451961 is an equidigital number, since it uses as much as digits as its factorization.

1221014451961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 1221014451961 in words is "one trillion, two hundred twenty-one billion, fourteen million, four hundred fifty-one thousand, nine hundred sixty-one".