21111100102220 has 12 divisors (see below), whose sum is σ = 44333310214704. Its totient is φ = 8444440040880.

The previous prime is 21111100102199. The next prime is 21111100102241. The reversal of 21111100102220 is 2220100111112.

It is an interprime number because it is at equal distance from previous prime (21111100102199) and next prime (21111100102241).

It is a junction number, because it is equal to n+sod(n) for n = 21111100102195 and 21111100102204.

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, 527777502536 + ... + 527777502575.

It is an arithmetic number, because the mean of its divisors is an integer number (3694442517892).

Almost surely, 2^{21111100102220} is an apocalyptic number.

21111100102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111100102220 is an abundant number, since it is smaller than the sum of its proper divisors (23222210112484).

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

21111100102220 is a wasteful number, since it uses less digits than its factorization.

21111100102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055555005120 (or 1055555005118 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111100102220 its reverse (2220100111112), we get a palindrome (23331200213332).

The spelling of 21111100102220 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, one hundred two thousand, two hundred twenty".