210221111978833 has 2 divisors, whose sum is σ = 210221111978834. Its totient is φ = 210221111978832.

The previous prime is 210221111978767. The next prime is 210221111978879. The reversal of 210221111978833 is 338879111122012.

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., 180662013277249 + 29559098701584 = 13441057^2 + 5436828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221111978833 is a prime.

It is not a weakly prime, because it can be changed into another prime (210221111978893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110555989416 + 105110555989417.

It is an arithmetic number, because the mean of its divisors is an integer number (105110555989417).

Almost surely, 2^{210221111978833} is an apocalyptic number.

It is an amenable number.

210221111978833 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221111978833 is an equidigital number, since it uses as much as digits as its factorization.

210221111978833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 210221111978833 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred eleven million, nine hundred seventy-eight thousand, eight hundred thirty-three".