21120012259 has 2 divisors, whose sum is σ = 21120012260. Its totient is φ = 21120012258.

The previous prime is 21120012253. The next prime is 21120012307. The reversal of 21120012259 is 95221002112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120012259 - 2⁹ = 21120011747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120012253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560006129 + 10560006130.

It is an arithmetic number, because the mean of its divisors is an integer number (10560006130).

Almost surely, 2^21120012259 is an apocalyptic number.

21120012259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120012259 is an equidigital number, since it uses as much as digits as its factorization.

21120012259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21120012259 in words is "twenty-one billion, one hundred twenty million, twelve thousand, two hundred fifty-nine".