121011111961 has 2 divisors, whose sum is σ = 121011111962. Its totient is φ = 121011111960.

The previous prime is 121011111953. The next prime is 121011111997. The reversal of 121011111961 is 169111110121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106958432025 + 14052679936 = 327045^2 + 118544^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011111961 - 2³ = 121011111953 is a prime.

It is not a weakly prime, because it can be changed into another prime (121011111901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505555980 + 60505555981.

It is an arithmetic number, because the mean of its divisors is an integer number (60505555981).

Almost surely, 2^121011111961 is an apocalyptic number.

It is an amenable number.

121011111961 is a deficient number, since it is larger than the sum of its proper divisors (1).

121011111961 is an equidigital number, since it uses as much as digits as its factorization.

121011111961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 25.

The spelling of 121011111961 in words is "one hundred twenty-one billion, eleven million, one hundred eleven thousand, nine hundred sixty-one".