1211011110961 has 2 divisors, whose sum is σ = 1211011110962. Its totient is φ = 1211011110960.

The previous prime is 1211011110949. The next prime is 1211011111007. The reversal of 1211011110961 is 1690111101121.

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., 766430211600 + 444580899361 = 875460^2 + 666769^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211011110961 - 2¹¹ = 1211011108913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211011110941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505555480 + 605505555481.

It is an arithmetic number, because the mean of its divisors is an integer number (605505555481).

Almost surely, 2^{1211011110961} is an apocalyptic number.

It is an amenable number.

1211011110961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011110961 is an equidigital number, since it uses as much as digits as its factorization.

1211011110961 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1211011110961 in words is "one trillion, two hundred eleven billion, eleven million, one hundred ten thousand, nine hundred sixty-one".