21432221320 has 32 divisors (see below), whose sum is σ = 48491913600. Its totient is φ = 8524992448.

The previous prime is 21432221303. The next prime is 21432221413. The reversal of 21432221320 is 2312223412.

It is a super-2 number, since 2×21432221320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21432221291 and 21432221300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489504 + ... + 1503823.

It is an arithmetic number, because the mean of its divisors is an integer number (1515372300).

Almost surely, 2^21432221320 is an apocalyptic number.

21432221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432221320 is an abundant number, since it is smaller than the sum of its proper divisors (27059692280).

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

21432221320 is a wasteful number, since it uses less digits than its factorization.

21432221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993517 (or 2993513 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21432221320 its reverse (2312223412), we get a palindrome (23744444732).

The spelling of 21432221320 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-one thousand, three hundred twenty".