21032331 has 8 divisors (see below), whose sum is σ = 28071744. Its totient is φ = 14007240.

The previous prime is 21032329. The next prime is 21032339. The reversal of 21032331 is 13323012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21032331 - 2¹ = 21032329 is a prime.

It is a super-2 number, since 2×21032331² = 884717894587122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21032331.

It is not an unprimeable number, because it can be changed into a prime (21032339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (3508968).

Almost surely, 2^21032331 is an apocalyptic number.

21032331 is a deficient number, since it is larger than the sum of its proper divisors (7039413).

21032331 is a wasteful number, since it uses less digits than its factorization.

21032331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21032331 is about 4586.1019395561. The cubic root of 21032331 is about 276.0339304011.

Adding to 21032331 its reverse (13323012), we get a palindrome (34355343).

The spelling of 21032331 in words is "twenty-one million, thirty-two thousand, three hundred thirty-one".