21110112021220 has 12 divisors (see below), whose sum is σ = 44331235244604. Its totient is φ = 8444044808480.

The previous prime is 21110112021133. The next prime is 21110112021293. The reversal of 21110112021220 is 2212021101112.

It can be written as a sum of positive squares in 2 ways, for example, as 5321584604736 + 15788527416484 = 2306856^2 + 3973478^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21110112021194 and 21110112021203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527752800511 + ... + 527752800550.

It is an arithmetic number, because the mean of its divisors is an integer number (3694269603717).

Almost surely, 2^{21110112021220} is an apocalyptic number.

21110112021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110112021220 is an abundant number, since it is smaller than the sum of its proper divisors (23221123223384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110112021220 is a wasteful number, since it uses less digits than its factorization.

21110112021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055505601070 (or 1055505601068 counting only the distinct ones).

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

Adding to 21110112021220 its reverse (2212021101112), we get a palindrome (23322133122332).

The spelling of 21110112021220 in words is "twenty-one trillion, one hundred ten billion, one hundred twelve million, twenty-one thousand, two hundred twenty".