21332231220 has 96 divisors (see below), whose sum is σ = 63104832000. Its totient is φ = 5375555584.

The previous prime is 21332231203. The next prime is 21332231233. The reversal of 21332231220 is 2213223312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48645 + ... + 212204.

It is an arithmetic number, because the mean of its divisors is an integer number (657342000).

Almost surely, 2^21332231220 is an apocalyptic number.

21332231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332231220 is an abundant number, since it is smaller than the sum of its proper divisors (41772600780).

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

21332231220 is a wasteful number, since it uses less digits than its factorization.

21332231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260937 (or 260935 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21332231220 its reverse (2213223312), we get a palindrome (23545454532).

The spelling of 21332231220 in words is "twenty-one billion, three hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty".