21102101000989 has 2 divisors, whose sum is σ = 21102101000990. Its totient is φ = 21102101000988.

The previous prime is 21102101000971. The next prime is 21102101001019. The reversal of 21102101000989 is 98900010120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16916291895364 + 4185809105625 = 4112942^2 + 2045925^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102101000989 - 2⁵ = 21102101000957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102101000689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551050500494 + 10551050500495.

It is an arithmetic number, because the mean of its divisors is an integer number (10551050500495).

Almost surely, 2^{21102101000989} is an apocalyptic number.

It is an amenable number.

21102101000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102101000989 is an equidigital number, since it uses as much as digits as its factorization.

21102101000989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 21102101000989 in words is "twenty-one trillion, one hundred two billion, one hundred one million, nine hundred eighty-nine", and thus it is an aban number.