21402025289 has 2 divisors, whose sum is σ = 21402025290. Its totient is φ = 21402025288.

The previous prime is 21402025243. The next prime is 21402025319. The reversal of 21402025289 is 98252020412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21085363264 + 316662025 = 145208^2 + 17795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21402025289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21402025219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701012644 + 10701012645.

It is an arithmetic number, because the mean of its divisors is an integer number (10701012645).

Almost surely, 2^21402025289 is an apocalyptic number.

It is an amenable number.

21402025289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402025289 is an equidigital number, since it uses as much as digits as its factorization.

21402025289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21402025289 in words is "twenty-one billion, four hundred two million, twenty-five thousand, two hundred eighty-nine".