21589097633 has 2 divisors, whose sum is σ = 21589097634. Its totient is φ = 21589097632.

The previous prime is 21589097627. The next prime is 21589097671. The reversal of 21589097633 is 33679098512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16457810944 + 5131286689 = 128288^2 + 71633^2 .

It is a cyclic number.

It is not a de Polignac number, because 21589097633 - 2⁴ = 21589097617 is a prime.

It is not a weakly prime, because it can be changed into another prime (21589097603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10794548816 + 10794548817.

It is an arithmetic number, because the mean of its divisors is an integer number (10794548817).

Almost surely, 2^21589097633 is an apocalyptic number.

It is an amenable number.

21589097633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21589097633 is an equidigital number, since it uses as much as digits as its factorization.

21589097633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 21589097633 in words is "twenty-one billion, five hundred eighty-nine million, ninety-seven thousand, six hundred thirty-three".