21152123189 has 2 divisors, whose sum is σ = 21152123190. Its totient is φ = 21152123188.

The previous prime is 21152123107. The next prime is 21152123227. The reversal of 21152123189 is 98132125112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14455974289 + 6696148900 = 120233^2 + 81830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152123189 - 2²⁸ = 20883687733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21152123089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576061594 + 10576061595.

It is an arithmetic number, because the mean of its divisors is an integer number (10576061595).

Almost surely, 2^21152123189 is an apocalyptic number.

It is an amenable number.

21152123189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152123189 is an equidigital number, since it uses as much as digits as its factorization.

21152123189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The spelling of 21152123189 in words is "twenty-one billion, one hundred fifty-two million, one hundred twenty-three thousand, one hundred eighty-nine".