21202032220 has 12 divisors (see below), whose sum is σ = 44524267704. Its totient is φ = 8480812880.

The previous prime is 21202032191. The next prime is 21202032233. The reversal of 21202032220 is 2223020212.

It is a junction number, because it is equal to n+sod(n) for n = 21202032194 and 21202032203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530050786 + ... + 530050825.

It is an arithmetic number, because the mean of its divisors is an integer number (3710355642).

Almost surely, 2^21202032220 is an apocalyptic number.

21202032220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202032220 is an abundant number, since it is smaller than the sum of its proper divisors (23322235484).

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

21202032220 is a wasteful number, since it uses less digits than its factorization.

21202032220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060101620 (or 1060101618 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21202032220 its reverse (2223020212), we get a palindrome (23425052432).

The spelling of 21202032220 in words is "twenty-one billion, two hundred two million, thirty-two thousand, two hundred twenty".