21013220523289 has 2 divisors, whose sum is σ = 21013220523290. Its totient is φ = 21013220523288.

The previous prime is 21013220523227. The next prime is 21013220523397. The reversal of 21013220523289 is 98232502231012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15132037760064 + 5881182763225 = 3889992^2 + 2425115^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013220523289 - 2¹³ = 21013220515097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013220523209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506610261644 + 10506610261645.

It is an arithmetic number, because the mean of its divisors is an integer number (10506610261645).

Almost surely, 2^{21013220523289} is an apocalyptic number.

It is an amenable number.

21013220523289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013220523289 is an equidigital number, since it uses as much as digits as its factorization.

21013220523289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21013220523289 in words is "twenty-one trillion, thirteen billion, two hundred twenty million, five hundred twenty-three thousand, two hundred eighty-nine".