21133121022 has 256 divisors, whose sum is σ = 54965433600. Its totient is φ = 5960908800.

The previous prime is 21133120979. The next prime is 21133121029. The reversal of 21133121022 is 22012133112.

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 = 21133120986 and 21133121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133121029) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 107274628 + ... + 107274824.

It is an arithmetic number, because the mean of its divisors is an integer number (214708725).

Almost surely, 2^21133121022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21133121022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27482716800).

21133121022 is an abundant number, since it is smaller than the sum of its proper divisors (33832312578).

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

21133121022 is a wasteful number, since it uses less digits than its factorization.

21133121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21133121022 its reverse (22012133112), we get a palindrome (43145254134).

The spelling of 21133121022 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-one thousand, twenty-two".