21100102220 has 12 divisors (see below), whose sum is σ = 44310214704. Its totient is φ = 8440040880.

The previous prime is 21100102213. The next prime is 21100102241. The reversal of 21100102220 is 2220100112.

It is a happy number.

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, 527502536 + ... + 527502575.

It is an arithmetic number, because the mean of its divisors is an integer number (3692517892).

Almost surely, 2^21100102220 is an apocalyptic number.

21100102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100102220 is an abundant number, since it is smaller than the sum of its proper divisors (23210112484).

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

21100102220 is a wasteful number, since it uses less digits than its factorization.

21100102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055005120 (or 1055005118 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100102220 its reverse (2220100112), we get a palindrome (23320202332).

The spelling of 21100102220 in words is "twenty-one billion, one hundred million, one hundred two thousand, two hundred twenty".