21421331320 has 16 divisors (see below), whose sum is σ = 48197995560. Its totient is φ = 8568532512.

The previous prime is 21421331311. The next prime is 21421331333. The reversal of 21421331320 is 2313312412.

It is a junction number, because it is equal to n+sod(n) for n = 21421331291 and 21421331300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267766602 + ... + 267766681.

Almost surely, 2^21421331320 is an apocalyptic number.

21421331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421331320 is an abundant number, since it is smaller than the sum of its proper divisors (26776664240).

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

21421331320 is a wasteful number, since it uses less digits than its factorization.

21421331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535533294 (or 535533290 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21421331320 its reverse (2313312412), we get a palindrome (23734643732).

The spelling of 21421331320 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty".