21200102220220 has 96 divisors (see below), whose sum is σ = 55645536683520. Its totient is φ = 6591179485440.

The previous prime is 21200102220203. The next prime is 21200102220223. The reversal of 21200102220220 is 2202220100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200102220194 and 21200102220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200102220223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16726530 + ... + 17949289.

It is an arithmetic number, because the mean of its divisors is an integer number (579641007120).

Almost surely, 2^{21200102220220} is an apocalyptic number.

21200102220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200102220220 is an abundant number, since it is smaller than the sum of its proper divisors (34445434463300).

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

21200102220220 is a wasteful number, since it uses less digits than its factorization.

21200102220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34676243 (or 34676241 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21200102220220 its reverse (2202220100212), we get a palindrome (23402322320432).

The spelling of 21200102220220 in words is "twenty-one trillion, two hundred billion, one hundred two million, two hundred twenty thousand, two hundred twenty".