21332031 has 16 divisors (see below), whose sum is σ = 33199104. Its totient is φ = 11929824.

The previous prime is 21332029. The next prime is 21332053. The reversal of 21332031 is 13023312.

It is not a de Polignac number, because 21332031 - 2¹ = 21332029 is a prime.

It is a super-2 number, since 2×21332031² = 910111093169922, 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 21332031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9820 + ... + 11793.

It is an arithmetic number, because the mean of its divisors is an integer number (2074944).

Almost surely, 2^21332031 is an apocalyptic number.

21332031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21332031 is a deficient number, since it is larger than the sum of its proper divisors (11867073).

21332031 is a wasteful number, since it uses less digits than its factorization.

21332031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21670.

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

The square root of 21332031 is about 4618.6611696465. The cubic root of 21332031 is about 277.3388659535.

Adding to 21332031 its reverse (13023312), we get a palindrome (34355343).

The spelling of 21332031 in words is "twenty-one million, three hundred thirty-two thousand, thirty-one".