21102200220 has 48 divisors (see below), whose sum is σ = 59172785280. Its totient is φ = 5619003456.

The previous prime is 21102200167. The next prime is 21102200267. The reversal of 21102200220 is 2200220112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21102200196 and 21102200205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216490 + ... + 298449.

It is an arithmetic number, because the mean of its divisors is an integer number (1232766360).

Almost surely, 2^21102200220 is an apocalyptic number.

21102200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102200220 is an abundant number, since it is smaller than the sum of its proper divisors (38070585060).

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

21102200220 is a wasteful number, since it uses less digits than its factorization.

21102200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515634 (or 515632 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21102200220 its reverse (2200220112), we get a palindrome (23302420332).

The spelling of 21102200220 in words is "twenty-one billion, one hundred two million, two hundred thousand, two hundred twenty".