21121100226 has 96 divisors (see below), whose sum is σ = 49653938880. Its totient is φ = 6466521600.

The previous prime is 21121100173. The next prime is 21121100227. The reversal of 21121100226 is 62200112112.

It is a super-2 number, since 2×21121100226² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21121100199 and 21121100208.

It is not an unprimeable number, because it can be changed into a prime (21121100227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2280966 + ... + 2290206.

It is an arithmetic number, because the mean of its divisors is an integer number (517228530).

Almost surely, 2^21121100226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121100226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24826969440).

21121100226 is an abundant number, since it is smaller than the sum of its proper divisors (28532838654).

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

21121100226 is a wasteful number, since it uses less digits than its factorization.

21121100226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472 (or 9469 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21121100226 its reverse (62200112112), we get a palindrome (83321212338).

The spelling of 21121100226 in words is "twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-six".