21311003195 has 8 divisors (see below), whose sum is σ = 25606291536. Its totient is φ = 17026744096.

The previous prime is 21311003149. The next prime is 21311003221. The reversal of 21311003195 is 59130011312.

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-21311003195 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2753057 + ... + 2760786.

It is an arithmetic number, because the mean of its divisors is an integer number (3200786442).

Almost surely, 2^21311003195 is an apocalyptic number.

21311003195 is a deficient number, since it is larger than the sum of its proper divisors (4295288341).

21311003195 is an equidigital number, since it uses as much as digits as its factorization.

21311003195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514621.

The product of its (nonzero) digits is 810, while the sum is 26.

The spelling of 21311003195 in words is "twenty-one billion, three hundred eleven million, three thousand, one hundred ninety-five".