21023211112109 has 2 divisors, whose sum is σ = 21023211112110. Its totient is φ = 21023211112108.

The previous prime is 21023211112021. The next prime is 21023211112157. The reversal of 21023211112109 is 90121111232012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19615376655625 + 1407834456484 = 4428925^2 + 1186522^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023211112109 - 2³² = 21018916144813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023211118109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511605556054 + 10511605556055.

It is an arithmetic number, because the mean of its divisors is an integer number (10511605556055).

Almost surely, 2^{21023211112109} is an apocalyptic number.

It is an amenable number.

21023211112109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023211112109 is an equidigital number, since it uses as much as digits as its factorization.

21023211112109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 21023211112109 in words is "twenty-one trillion, twenty-three billion, two hundred eleven million, one hundred twelve thousand, one hundred nine".