21620101589 has 2 divisors, whose sum is σ = 21620101590. Its totient is φ = 21620101588.

The previous prime is 21620101519. The next prime is 21620101603. The reversal of 21620101589 is 98510102612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17500644100 + 4119457489 = 132290^2 + 64183^2 .

It is a cyclic number.

It is not a de Polignac number, because 21620101589 - 2⁸ = 21620101333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21620101519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810050794 + 10810050795.

It is an arithmetic number, because the mean of its divisors is an integer number (10810050795).

Almost surely, 2^21620101589 is an apocalyptic number.

It is an amenable number.

21620101589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21620101589 is an equidigital number, since it uses as much as digits as its factorization.

21620101589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 21620101589 in words is "twenty-one billion, six hundred twenty million, one hundred one thousand, five hundred eighty-nine".