21133313232 has 20 divisors (see below), whose sum is σ = 54594392640. Its totient is φ = 7044437728.

The previous prime is 21133313221. The next prime is 21133313239. The reversal of 21133313232 is 23231333112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133313239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220138632 + ... + 220138727.

It is an arithmetic number, because the mean of its divisors is an integer number (2729719632).

Almost surely, 2^21133313232 is an apocalyptic number.

It is an amenable number.

21133313232 is an abundant number, since it is smaller than the sum of its proper divisors (33461079408).

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

21133313232 is a wasteful number, since it uses less digits than its factorization.

21133313232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440277370 (or 440277364 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

Adding to 21133313232 its reverse (23231333112), we get a palindrome (44364646344).

The spelling of 21133313232 in words is "twenty-one billion, one hundred thirty-three million, three hundred thirteen thousand, two hundred thirty-two".