2121120061 has 2 divisors, whose sum is σ = 2121120062. Its totient is φ = 2121120060.

The previous prime is 2121120031. The next prime is 2121120137. The reversal of 2121120061 is 1600211212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1797336025 + 323784036 = 42395^2 + 17994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121120061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121120031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060560030 + 1060560031.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560031).

Almost surely, 2^2121120061 is an apocalyptic number.

It is an amenable number.

2121120061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121120061 is an equidigital number, since it uses as much as digits as its factorization.

2121120061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2121120061 is about 46055.6192119919. The cubic root of 2121120061 is about 1284.8578546456.

Adding to 2121120061 its reverse (1600211212), we get a palindrome (3721331273).

The spelling of 2121120061 in words is "two billion, one hundred twenty-one million, one hundred twenty thousand, sixty-one".