21133320208 has 120 divisors (see below), whose sum is σ = 55278801216. Its totient is φ = 7600320000.

The previous prime is 21133320179. The next prime is 21133320227. The reversal of 21133320208 is 80202333112.

It is a super-2 number, since 2×21133320208² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157458 + ... + 258958.

Almost surely, 2^21133320208 is an apocalyptic number.

21133320208 is a gapful number since it is divisible by the number (28) 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 21133320208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27639400608).

21133320208 is an abundant number, since it is smaller than the sum of its proper divisors (34145481008).

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

21133320208 is a wasteful number, since it uses less digits than its factorization.

21133320208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101553 (or 101534 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 21133320208 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty thousand, two hundred eight".