21626661052589 has 2 divisors, whose sum is σ = 21626661052590. Its totient is φ = 21626661052588.

The previous prime is 21626661052559. The next prime is 21626661052603. The reversal of 21626661052589 is 98525016662612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21485848490089 + 140812562500 = 4635283^2 + 375250^2 .

It is a cyclic number.

It is not a de Polignac number, because 21626661052589 - 2¹⁶ = 21626660987053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21626661052519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813330526294 + 10813330526295.

It is an arithmetic number, because the mean of its divisors is an integer number (10813330526295).

Almost surely, 2^{21626661052589} is an apocalyptic number.

It is an amenable number.

21626661052589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21626661052589 is an equidigital number, since it uses as much as digits as its factorization.

21626661052589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 59.

The spelling of 21626661052589 in words is "twenty-one trillion, six hundred twenty-six billion, six hundred sixty-one million, fifty-two thousand, five hundred eighty-nine".