21411589 has 2 divisors, whose sum is σ = 21411590. Its totient is φ = 21411588.

The previous prime is 21411587. The next prime is 21411617. The reversal of 21411589 is 98511412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19070689 + 2340900 = 4367^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411589 - 2¹ = 21411587 is a prime.

It is a super-2 number, since 2×21411589² = 916912287009842, which contains 22 as substring.

Together with 21411587, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21411589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21411581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705794 + 10705795.

It is an arithmetic number, because the mean of its divisors is an integer number (10705795).

Almost surely, 2^21411589 is an apocalyptic number.

It is an amenable number.

21411589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411589 is an equidigital number, since it uses as much as digits as its factorization.

21411589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 21411589 is about 4627.2658233562. The cubic root of 21411589 is about 277.6832174789.

The spelling of 21411589 in words is "twenty-one million, four hundred eleven thousand, five hundred eighty-nine".