21022100212220 has 24 divisors (see below), whose sum is σ = 44146744059600. Its totient is φ = 8408776539392.

The previous prime is 21022100212207. The next prime is 21022100212229. The reversal of 21022100212220 is 2221200122012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022100212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1212110 + ... + 6596469.

It is an arithmetic number, because the mean of its divisors is an integer number (1839447669150).

Almost surely, 2^{21022100212220} is an apocalyptic number.

21022100212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022100212220 is an abundant number, since it is smaller than the sum of its proper divisors (23124643847380).

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

21022100212220 is a wasteful number, since it uses less digits than its factorization.

21022100212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7943197 (or 7943195 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022100212220 its reverse (2221200122012), we get a palindrome (23243300334232).

The spelling of 21022100212220 in words is "twenty-one trillion, twenty-two billion, one hundred million, two hundred twelve thousand, two hundred twenty".