21331141 has 16 divisors (see below), whose sum is σ = 24482304. Its totient is φ = 18411264.

The previous prime is 21331133. The next prime is 21331147. The reversal of 21331141 is 14113312.

It is a cyclic number.

It is not a de Polignac number, because 21331141 - 2³ = 21331133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57940 + ... + 58306.

It is an arithmetic number, because the mean of its divisors is an integer number (1530144).

Almost surely, 2^21331141 is an apocalyptic number.

It is an amenable number.

21331141 is a deficient number, since it is larger than the sum of its proper divisors (3151163).

21331141 is a wasteful number, since it uses less digits than its factorization.

21331141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 72, while the sum is 16.

The square root of 21331141 is about 4618.5648203744. The cubic root of 21331141 is about 277.3350089208.

Adding to 21331141 its reverse (14113312), we get a palindrome (35444453).

The spelling of 21331141 in words is "twenty-one million, three hundred thirty-one thousand, one hundred forty-one".