21321301332 has 48 divisors (see below), whose sum is σ = 52943647680. Its totient is φ = 6655068672.

The previous prime is 21321301291. The next prime is 21321301399. The reversal of 21321301332 is 23310312312.

It is a junction number, because it is equal to n+sod(n) for n = 21321301299 and 21321301308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225082 + ... + 305457.

It is an arithmetic number, because the mean of its divisors is an integer number (1102992660).

Almost surely, 2^21321301332 is an apocalyptic number.

It is an amenable number.

21321301332 is an abundant number, since it is smaller than the sum of its proper divisors (31622346348).

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

21321301332 is a wasteful number, since it uses less digits than its factorization.

21321301332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530760 (or 530758 counting only the distinct ones).

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

Adding to 21321301332 its reverse (23310312312), we get a palindrome (44631613644).

The spelling of 21321301332 in words is "twenty-one billion, three hundred twenty-one million, three hundred one thousand, three hundred thirty-two".