21202103089 has 2 divisors, whose sum is σ = 21202103090. Its totient is φ = 21202103088.

The previous prime is 21202103077. The next prime is 21202103099. The reversal of 21202103089 is 98030120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15771592225 + 5430510864 = 125585^2 + 73692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202103089 - 2¹⁵ = 21202070321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202103099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601051544 + 10601051545.

It is an arithmetic number, because the mean of its divisors is an integer number (10601051545).

Almost surely, 2^21202103089 is an apocalyptic number.

It is an amenable number.

21202103089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202103089 is an equidigital number, since it uses as much as digits as its factorization.

21202103089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21202103089 in words is "twenty-one billion, two hundred two million, one hundred three thousand, eighty-nine".