2121322245949 has 2 divisors, whose sum is σ = 2121322245950. Its totient is φ = 2121322245948.

The previous prime is 2121322245947. The next prime is 2121322245971. The reversal of 2121322245949 is 9495422231212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392501481849 + 728820764100 = 1180043^2 + 853710^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121322245949 - 2¹ = 2121322245947 is a prime.

Together with 2121322245947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2121322245899 and 2121322245908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121322245943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060661122974 + 1060661122975.

It is an arithmetic number, because the mean of its divisors is an integer number (1060661122975).

Almost surely, 2^{2121322245949} is an apocalyptic number.

It is an amenable number.

2121322245949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121322245949 is an equidigital number, since it uses as much as digits as its factorization.

2121322245949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The spelling of 2121322245949 in words is "two trillion, one hundred twenty-one billion, three hundred twenty-two million, two hundred forty-five thousand, nine hundred forty-nine".