21221101122 has 64 divisors (see below), whose sum is σ = 48473074944. Its totient is φ = 6135644160.

The previous prime is 21221101081. The next prime is 21221101169. The reversal of 21221101122 is 22110112212.

21221101122 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 837483 + ... + 862449.

It is an arithmetic number, because the mean of its divisors is an integer number (757391796).

Almost surely, 2^21221101122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221101122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24236537472).

21221101122 is an abundant number, since it is smaller than the sum of its proper divisors (27251973822).

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

21221101122 is a wasteful number, since it uses less digits than its factorization.

21221101122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25643.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221101122 its reverse (22110112212), we get a palindrome (43331213334).

The spelling of 21221101122 in words is "twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred twenty-two".