21231032 has 32 divisors (see below), whose sum is σ = 41817600. Its totient is φ = 10092000.

The previous prime is 21231029. The next prime is 21231107. The reversal of 21231032 is 23013212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21230998 and 21231016.

It is a congruent number.

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, 13907 + ... + 15357.

It is an arithmetic number, because the mean of its divisors is an integer number (1306800).

It is a self-describing number.

Almost surely, 2^21231032 is an apocalyptic number.

It is an amenable number.

21231032 is a deficient number, since it is larger than the sum of its proper divisors (20586568).

21231032 is a wasteful number, since it uses less digits than its factorization.

21231032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21231032 is about 4607.7144008717. The cubic root of 21231032 is about 276.9004755692.

Adding to 21231032 its reverse (23013212), we get a palindrome (44244244).

The spelling of 21231032 in words is "twenty-one million, two hundred thirty-one thousand, thirty-two".