21020110102220 has 24 divisors (see below), whose sum is σ = 44890404627600. Its totient is φ = 8265534819392.

The previous prime is 21020110102207. The next prime is 21020110102241. The reversal of 21020110102220 is 2220101102012.

It is a junction number, because it is equal to n+sod(n) for n = 21020110102195 and 21020110102204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8906825135 + ... + 8906827494.

It is an arithmetic number, because the mean of its divisors is an integer number (1870433526150).

Almost surely, 2^{21020110102220} is an apocalyptic number.

21020110102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020110102220 is an abundant number, since it is smaller than the sum of its proper divisors (23870294525380).

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

21020110102220 is a wasteful number, since it uses less digits than its factorization.

21020110102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17813652697 (or 17813652695 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020110102220 its reverse (2220101102012), we get a palindrome (23240211204232).

The spelling of 21020110102220 in words is "twenty-one trillion, twenty billion, one hundred ten million, one hundred two thousand, two hundred twenty".