2120011961 has 2 divisors, whose sum is σ = 2120011962. Its totient is φ = 2120011960.

The previous prime is 2120011931. The next prime is 2120011987. The reversal of 2120011961 is 1691100212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2114160400 + 5851561 = 45980^2 + 2419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120011961 is a prime.

It is not a weakly prime, because it can be changed into another prime (2120011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060005980 + 1060005981.

It is an arithmetic number, because the mean of its divisors is an integer number (1060005981).

Almost surely, 2^2120011961 is an apocalyptic number.

It is an amenable number.

2120011961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120011961 is an equidigital number, since it uses as much as digits as its factorization.

2120011961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 2120011961 is about 46043.5876208620. The cubic root of 2120011961 is about 1284.6340736638.

The spelling of 2120011961 in words is "two billion, one hundred twenty million, eleven thousand, nine hundred sixty-one".