21133213320 has 64 divisors (see below), whose sum is σ = 64439000640. Its totient is φ = 5543136000.

The previous prime is 21133213313. The next prime is 21133213337. The reversal of 21133213320 is 2331233112.

It is a super-2 number, since 2×21133213320² (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 15 ways as a sum of consecutive naturals, for example, 1436206 + ... + 1450845.

It is an arithmetic number, because the mean of its divisors is an integer number (1006859385).

Almost surely, 2^21133213320 is an apocalyptic number.

21133213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133213320 is an abundant number, since it is smaller than the sum of its proper divisors (43305787320).

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

21133213320 is a wasteful number, since it uses less digits than its factorization.

21133213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887126 (or 2887122 counting only the distinct ones).

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

Adding to 21133213320 its reverse (2331233112), we get a palindrome (23464446432).

The spelling of 21133213320 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirteen thousand, three hundred twenty".