21311120999 has 8 divisors (see below), whose sum is σ = 24949605408. Its totient is φ = 17821146240.

The previous prime is 21311120981. The next prime is 21311121043. The reversal of 21311120999 is 99902111312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311120999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311120959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37127102 + ... + 37127675.

It is an arithmetic number, because the mean of its divisors is an integer number (3118700676).

Almost surely, 2^21311120999 is an apocalyptic number.

21311120999 is a deficient number, since it is larger than the sum of its proper divisors (3638484409).

21311120999 is an equidigital number, since it uses as much as digits as its factorization.

21311120999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74254825.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 21311120999 in words is "twenty-one billion, three hundred eleven million, one hundred twenty thousand, nine hundred ninety-nine".