21321231032 has 16 divisors (see below), whose sum is σ = 40025660760. Its totient is φ = 10647721504.

The previous prime is 21321231031. The next prime is 21321231053. The reversal of 21321231032 is 23013212312.

It is a junction number, because it is equal to n+sod(n) for n = 21321230995 and 21321231013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321231031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604723 + ... + 1617954.

Almost surely, 2^21321231032 is an apocalyptic number.

It is an amenable number.

21321231032 is a deficient number, since it is larger than the sum of its proper divisors (18704429728).

21321231032 is a wasteful number, since it uses less digits than its factorization.

21321231032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223510 (or 3223506 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21321231032 its reverse (23013212312), we get a palindrome (44334443344).

The spelling of 21321231032 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty-one thousand, thirty-two".