21122112200 has 96 divisors (see below), whose sum is σ = 56188963200. Its totient is φ = 7233546240.

The previous prime is 21122112191. The next prime is 21122112203. The reversal of 21122112200 is 221122112.

It is a super-2 number, since 2×21122112200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21122112203) 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, 1278392 + ... + 1294808.

It is an arithmetic number, because the mean of its divisors is an integer number (585301700).

Almost surely, 2^21122112200 is an apocalyptic number.

21122112200 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 21122112200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28094481600).

21122112200 is an abundant number, since it is smaller than the sum of its proper divisors (35066851000).

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

21122112200 is a wasteful number, since it uses less digits than its factorization.

21122112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17359 (or 17350 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122112200 its reverse (221122112), we get a palindrome (21343234312).

The spelling of 21122112200 in words is "twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, two hundred".