21732856489 has 2 divisors, whose sum is σ = 21732856490. Its totient is φ = 21732856488.

The previous prime is 21732856451. The next prime is 21732856513. The reversal of 21732856489 is 98465823712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17351475625 + 4381380864 = 131725^2 + 66192^2 .

It is a cyclic number.

It is not a de Polignac number, because 21732856489 - 2⁷ = 21732856361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21732851489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10866428244 + 10866428245.

It is an arithmetic number, because the mean of its divisors is an integer number (10866428245).

Almost surely, 2^21732856489 is an apocalyptic number.

It is an amenable number.

21732856489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21732856489 is an equidigital number, since it uses as much as digits as its factorization.

21732856489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The spelling of 21732856489 in words is "twenty-one billion, seven hundred thirty-two million, eight hundred fifty-six thousand, four hundred eighty-nine".