2120211219961 has 2 divisors, whose sum is σ = 2120211219962. Its totient is φ = 2120211219960.

The previous prime is 2120211219943. The next prime is 2120211220007. The reversal of 2120211219961 is 1699121120212.

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., 1394716122361 + 725495097600 = 1180981^2 + 851760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120211219961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120211219961.

It is not a weakly prime, because it can be changed into another prime (2120211219941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105609980 + 1060105609981.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105609981).

Almost surely, 2^{2120211219961} is an apocalyptic number.

It is an amenable number.

2120211219961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120211219961 is an equidigital number, since it uses as much as digits as its factorization.

2120211219961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 37.

The spelling of 2120211219961 in words is "two trillion, one hundred twenty billion, two hundred eleven million, two hundred nineteen thousand, nine hundred sixty-one".