21012202100189 has 2 divisors, whose sum is σ = 21012202100190. Its totient is φ = 21012202100188.

The previous prime is 21012202100179. The next prime is 21012202100209. The reversal of 21012202100189 is 98100120221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17876618205625 + 3135583894564 = 4228075^2 + 1770758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012202100189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012202100179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506101050094 + 10506101050095.

It is an arithmetic number, because the mean of its divisors is an integer number (10506101050095).

Almost surely, 2^{21012202100189} is an apocalyptic number.

It is an amenable number.

21012202100189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012202100189 is an equidigital number, since it uses as much as digits as its factorization.

21012202100189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21012202100189 in words is "twenty-one trillion, twelve billion, two hundred two million, one hundred thousand, one hundred eighty-nine".