21230011331959 has 2 divisors, whose sum is σ = 21230011331960. Its totient is φ = 21230011331958.

The previous prime is 21230011331951. The next prime is 21230011332107. The reversal of 21230011331959 is 95913311003212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21230011331959 - 2³ = 21230011331951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230011331951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615005665979 + 10615005665980.

It is an arithmetic number, because the mean of its divisors is an integer number (10615005665980).

Almost surely, 2^{21230011331959} is an apocalyptic number.

21230011331959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230011331959 is an equidigital number, since it uses as much as digits as its factorization.

21230011331959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The spelling of 21230011331959 in words is "twenty-one trillion, two hundred thirty billion, eleven million, three hundred thirty-one thousand, nine hundred fifty-nine".