21020022200 has 48 divisors (see below), whose sum is σ = 49000677000. Its totient is φ = 8385793920.

The previous prime is 21020022187. The next prime is 21020022209. The reversal of 21020022200 is 222002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020022209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62855 + ... + 214454.

Almost surely, 2^21020022200 is an apocalyptic number.

21020022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020022200 is an abundant number, since it is smaller than the sum of its proper divisors (27980654800).

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

21020022200 is a wasteful number, since it uses less digits than its factorization.

21020022200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277704 (or 277695 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21020022200 its reverse (222002012), we get a palindrome (21242024212).

The spelling of 21020022200 in words is "twenty-one billion, twenty million, twenty-two thousand, two hundred".