21120110102221 has 16 divisors (see below), whose sum is σ = 22881885239808. Its totient is φ = 19377937756800.

The previous prime is 21120110102183. The next prime is 21120110102227. The reversal of 21120110102221 is 12220101102112.

It is a cyclic number.

It is not a de Polignac number, because 21120110102221 - 2¹⁵ = 21120110069453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120110102195 and 21120110102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110102227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55302636 + ... + 55683226.

It is an arithmetic number, because the mean of its divisors is an integer number (1430117827488).

Almost surely, 2^{21120110102221} is an apocalyptic number.

It is an amenable number.

21120110102221 is a deficient number, since it is larger than the sum of its proper divisors (1761775137587).

21120110102221 is a wasteful number, since it uses less digits than its factorization.

21120110102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406332.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120110102221 its reverse (12220101102112), we get a palindrome (33340211204333).

The spelling of 21120110102221 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, one hundred two thousand, two hundred twenty-one".