21101122210220 has 48 divisors (see below), whose sum is σ = 49260386558208. Its totient is φ = 7539855079680.

The previous prime is 21101122210163. The next prime is 21101122210297. The reversal of 21101122210220 is 2201222110112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1308994559 + ... + 1309010678.

It is an arithmetic number, because the mean of its divisors is an integer number (1026258053296).

Almost surely, 2^{21101122210220} is an apocalyptic number.

21101122210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101122210220 is an abundant number, since it is smaller than the sum of its proper divisors (28159264347988).

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

21101122210220 is a wasteful number, since it uses less digits than its factorization.

21101122210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618005290 (or 2618005288 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21101122210220 its reverse (2201222110112), we get a palindrome (23302344320332).

The spelling of 21101122210220 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, two hundred ten thousand, two hundred twenty".