21228698200 has 96 divisors (see below), whose sum is σ = 50833197360. Its totient is φ = 8238758400.

The previous prime is 21228698173. The next prime is 21228698203. The reversal of 21228698200 is 289682212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21228698203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2756355 + ... + 2764045.

Almost surely, 2^21228698200 is an apocalyptic number.

21228698200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21228698200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25416598680).

21228698200 is an abundant number, since it is smaller than the sum of its proper divisors (29604499160).

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

21228698200 is a wasteful number, since it uses less digits than its factorization.

21228698200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117 (or 8108 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21228698200 in words is "twenty-one billion, two hundred twenty-eight million, six hundred ninety-eight thousand, two hundred".