21010122200989 has 2 divisors, whose sum is σ = 21010122200990. Its totient is φ = 21010122200988.

The previous prime is 21010122200933. The next prime is 21010122201001. The reversal of 21010122200989 is 98900222101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14375222012089 + 6634900188900 = 3791467^2 + 2575830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010122200989 - 2³¹ = 21007974717341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010122200189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505061100494 + 10505061100495.

It is an arithmetic number, because the mean of its divisors is an integer number (10505061100495).

Almost surely, 2^{21010122200989} is an apocalyptic number.

It is an amenable number.

21010122200989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010122200989 is an equidigital number, since it uses as much as digits as its factorization.

21010122200989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 21010122200989 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, two hundred thousand, nine hundred eighty-nine".