21100988459 has 2 divisors, whose sum is σ = 21100988460. Its totient is φ = 21100988458.

The previous prime is 21100988437. The next prime is 21100988473. The reversal of 21100988459 is 95488900112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100988459 - 2²⁸ = 20832553003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100988059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550494229 + 10550494230.

It is an arithmetic number, because the mean of its divisors is an integer number (10550494230).

Almost surely, 2^21100988459 is an apocalyptic number.

21100988459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100988459 is an equidigital number, since it uses as much as digits as its factorization.

21100988459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 21100988459 in words is "twenty-one billion, one hundred million, nine hundred eighty-eight thousand, four hundred fifty-nine".