21133321320 has 32 divisors (see below), whose sum is σ = 63399964320. Its totient is φ = 5635552320.

The previous prime is 21133321309. The next prime is 21133321343. The reversal of 21133321320 is 2312333112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88055386 + ... + 88055625.

It is an arithmetic number, because the mean of its divisors is an integer number (1981248885).

Almost surely, 2^21133321320 is an apocalyptic number.

21133321320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21133321320 is an abundant number, since it is smaller than the sum of its proper divisors (42266643000).

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

21133321320 is a wasteful number, since it uses less digits than its factorization.

21133321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176111025 (or 176111021 counting only the distinct ones).

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

Adding to 21133321320 its reverse (2312333112), we get a palindrome (23445654432).

The spelling of 21133321320 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, three hundred twenty".