2120039246861 has 2 divisors, whose sum is σ = 2120039246862. Its totient is φ = 2120039246860.

The previous prime is 2120039246849. The next prime is 2120039246989. The reversal of 2120039246861 is 1686429300212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059655522500 + 60383724361 = 1435150^2 + 245731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120039246861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120039242861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060019623430 + 1060019623431.

It is an arithmetic number, because the mean of its divisors is an integer number (1060019623431).

Almost surely, 2^{2120039246861} is an apocalyptic number.

It is an amenable number.

2120039246861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120039246861 is an equidigital number, since it uses as much as digits as its factorization.

2120039246861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 2120039246861 in words is "two trillion, one hundred twenty billion, thirty-nine million, two hundred forty-six thousand, eight hundred sixty-one".