21460635589 has 2 divisors, whose sum is σ = 21460635590. Its totient is φ = 21460635588.

The previous prime is 21460635587. The next prime is 21460635611. The reversal of 21460635589 is 98553606412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18072231489 + 3388404100 = 134433^2 + 58210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21460635589 - 2¹ = 21460635587 is a prime.

Together with 21460635587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21460635587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730317794 + 10730317795.

It is an arithmetic number, because the mean of its divisors is an integer number (10730317795).

Almost surely, 2^21460635589 is an apocalyptic number.

It is an amenable number.

21460635589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21460635589 is an equidigital number, since it uses as much as digits as its factorization.

21460635589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 21460635589 in words is "twenty-one billion, four hundred sixty million, six hundred thirty-five thousand, five hundred eighty-nine".