21111103191 has 8 divisors (see below), whose sum is σ = 28148832000. Its totient is φ = 14073721592.

The previous prime is 21111103177. The next prime is 21111103241. The reversal of 21111103191 is 19130111112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111103191 - 2⁵ = 21111103159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111103121) 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, 138946 + ... + 248048.

It is an arithmetic number, because the mean of its divisors is an integer number (3518604000).

Almost surely, 2^21111103191 is an apocalyptic number.

21111103191 is a deficient number, since it is larger than the sum of its proper divisors (7037728809).

21111103191 is a wasteful number, since it uses less digits than its factorization.

21111103191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173605.

The product of its (nonzero) digits is 54, while the sum is 21.

The spelling of 21111103191 in words is "twenty-one billion, one hundred eleven million, one hundred three thousand, one hundred ninety-one".