21110111112021 has 8 divisors (see below), whose sum is σ = 28213990986720. Its totient is φ = 14039819322672.

The previous prime is 21110111111993. The next prime is 21110111112029. The reversal of 21110111112021 is 12021111101112.

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

It is not a de Polignac number, because 21110111112021 - 2¹⁴ = 21110111095637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111112029) 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, 8397019870 + ... + 8397022383.

It is an arithmetic number, because the mean of its divisors is an integer number (3526748873340).

Almost surely, 2^{21110111112021} is an apocalyptic number.

It is an amenable number.

21110111112021 is a deficient number, since it is larger than the sum of its proper divisors (7103879874699).

21110111112021 is a wasteful number, since it uses less digits than its factorization.

21110111112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16794042675.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110111112021 its reverse (12021111101112), we get a palindrome (33131222213133).

The spelling of 21110111112021 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one hundred twelve thousand, twenty-one".