211098161921 has 2 divisors, whose sum is σ = 211098161922. Its totient is φ = 211098161920.

The previous prime is 211098161909. The next prime is 211098161959. The reversal of 211098161921 is 129161890112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160031201521 + 51066960400 = 400039^2 + 225980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211098161921 is a prime.

It is not a weakly prime, because it can be changed into another prime (211098161971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105549080960 + 105549080961.

It is an arithmetic number, because the mean of its divisors is an integer number (105549080961).

Almost surely, 2^211098161921 is an apocalyptic number.

It is an amenable number.

211098161921 is a deficient number, since it is larger than the sum of its proper divisors (1).

211098161921 is an equidigital number, since it uses as much as digits as its factorization.

211098161921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 41.

The spelling of 211098161921 in words is "two hundred eleven billion, ninety-eight million, one hundred sixty-one thousand, nine hundred twenty-one".