21292589 has 2 divisors, whose sum is σ = 21292590. Its totient is φ = 21292588.

The previous prime is 21292577. The next prime is 21292613. The reversal of 21292589 is 98529212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 3736489 = 4190^2 + 1933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21292589 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21292519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646294 + 10646295.

It is an arithmetic number, because the mean of its divisors is an integer number (10646295).

Almost surely, 2^21292589 is an apocalyptic number.

It is an amenable number.

21292589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21292589 is an equidigital number, since it uses as much as digits as its factorization.

21292589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 21292589 is about 4614.3893420473. The cubic root of 21292589 is about 277.1678313206.

The spelling of 21292589 in words is "twenty-one million, two hundred ninety-two thousand, five hundred eighty-nine".