21110102220 has 48 divisors (see below), whose sum is σ = 59126715648. Its totient is φ = 5627605440.

The previous prime is 21110102197. The next prime is 21110102227. The reversal of 21110102220 is 2220101112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21110102196 and 21110102205.

It is not an unprimeable number, because it can be changed into a prime (21110102227) 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, 145225 + ... + 251615.

It is an arithmetic number, because the mean of its divisors is an integer number (1231806576).

Almost surely, 2^21110102220 is an apocalyptic number.

21110102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110102220 is an abundant number, since it is smaller than the sum of its proper divisors (38016613428).

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

21110102220 is a wasteful number, since it uses less digits than its factorization.

21110102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109710 (or 109708 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110102220 its reverse (2220101112), we get a palindrome (23330203332).

The spelling of 21110102220 in words is "twenty-one billion, one hundred ten million, one hundred two thousand, two hundred twenty".