21230011331999 has 4 divisors (see below), whose sum is σ = 21747816486480. Its totient is φ = 20712206177520.

The previous prime is 21230011331959. The next prime is 21230011332107. The reversal of 21230011331999 is 99913311003212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230011331999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230011331929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258902577179 + ... + 258902577260.

It is an arithmetic number, because the mean of its divisors is an integer number (5436954121620).

Almost surely, 2^{21230011331999} is an apocalyptic number.

21230011331999 is a deficient number, since it is larger than the sum of its proper divisors (517805154481).

21230011331999 is an equidigital number, since it uses as much as digits as its factorization.

21230011331999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517805154480.

The product of its (nonzero) digits is 78732, while the sum is 44.

The spelling of 21230011331999 in words is "twenty-one trillion, two hundred thirty billion, eleven million, three hundred thirty-one thousand, nine hundred ninety-nine".