21133221330 has 256 divisors, whose sum is σ = 59491998720. Its totient is φ = 4761157632.

The previous prime is 21133221253. The next prime is 21133221337. The reversal of 21133221330 is 3312233112.

It is a super-2 number, since 2×21133221330² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133221297 and 21133221306.

It is not an unprimeable number, because it can be changed into a prime (21133221337) 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, 35637514 + ... + 35638106.

It is an arithmetic number, because the mean of its divisors is an integer number (232390620).

Almost surely, 2^21133221330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21133221330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29745999360).

21133221330 is an abundant number, since it is smaller than the sum of its proper divisors (38358777390).

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

21133221330 is a wasteful number, since it uses less digits than its factorization.

21133221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21133221330 its reverse (3312233112), we get a palindrome (24445454442).

The spelling of 21133221330 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, three hundred thirty".