21110110999 has 32 divisors (see below), whose sum is σ = 22568440320. Its totient is φ = 19705437312.

The previous prime is 21110110939. The next prime is 21110111003. The reversal of 21110110999 is 99901101112.

It is not a de Polignac number, because 21110110999 - 2⁷ = 21110110871 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 (21110110939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76209649 + ... + 76209925.

It is an arithmetic number, because the mean of its divisors is an integer number (705263760).

Almost surely, 2^21110110999 is an apocalyptic number.

21110110999 is a deficient number, since it is larger than the sum of its proper divisors (1458329321).

21110110999 is a wasteful number, since it uses less digits than its factorization.

21110110999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 1458, while the sum is 34.

The spelling of 21110110999 in words is "twenty-one billion, one hundred ten million, one hundred ten thousand, nine hundred ninety-nine".