21113222200 has 48 divisors (see below), whose sum is σ = 56100851280. Its totient is φ = 7238818560.

The previous prime is 21113222197. The next prime is 21113222201. The reversal of 21113222200 is 222231112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113222201) 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, 7539037 + ... + 7541836.

It is an arithmetic number, because the mean of its divisors is an integer number (1168767735).

Almost surely, 2^21113222200 is an apocalyptic number.

21113222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113222200 is an abundant number, since it is smaller than the sum of its proper divisors (34987629080).

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

21113222200 is a wasteful number, since it uses less digits than its factorization.

21113222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15080896 (or 15080887 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21113222200 its reverse (222231112), we get a palindrome (21335453312).

It can be divided in two parts, 211132 and 22200, that added together give a palindrome (233332).

The spelling of 21113222200 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty-two thousand, two hundred".