210021122221249 has 2 divisors, whose sum is σ = 210021122221250. Its totient is φ = 210021122221248.

The previous prime is 210021122221217. The next prime is 210021122221259. The reversal of 210021122221249 is 942122221120012.

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., 186852687731649 + 23168434489600 = 13669407^2 + 4813360^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021122221249 - 2⁵ = 210021122221217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210021122221249.

It is not a weakly prime, because it can be changed into another prime (210021122221259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010561110624 + 105010561110625.

It is an arithmetic number, because the mean of its divisors is an integer number (105010561110625).

Almost surely, 2^{210021122221249} is an apocalyptic number.

It is an amenable number.

210021122221249 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021122221249 is an equidigital number, since it uses as much as digits as its factorization.

210021122221249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 210021122221249 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred forty-nine".