21101102202220 has 24 divisors (see below), whose sum is σ = 44810205804000. Its totient is φ = 8345604465792.

The previous prime is 21101102202217. The next prime is 21101102202253. The reversal of 21101102202220 is 2220220110112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21101102202194 and 21101102202203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5927274120 + ... + 5927277679.

It is an arithmetic number, because the mean of its divisors is an integer number (1867091908500).

Almost surely, 2^{21101102202220} is an apocalyptic number.

21101102202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101102202220 is an abundant number, since it is smaller than the sum of its proper divisors (23709103601780).

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

21101102202220 is a wasteful number, since it uses less digits than its factorization.

21101102202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11854551897 (or 11854551895 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101102202220 its reverse (2220220110112), we get a palindrome (23321322312332).

The spelling of 21101102202220 in words is "twenty-one trillion, one hundred one billion, one hundred two million, two hundred two thousand, two hundred twenty".