21374331 has 16 divisors (see below), whose sum is σ = 31753728. Its totient is φ = 12677600.

The previous prime is 21374299. The next prime is 21374333. The reversal of 21374331 is 13347312.

It is a cyclic number.

It is not a de Polignac number, because 21374331 - 2⁵ = 21374299 is a prime.

It is a super-2 number, since 2×21374331² = 913724051395122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21374333) 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, 5340 + ... + 8441.

It is an arithmetic number, because the mean of its divisors is an integer number (1984608).

Almost surely, 2^21374331 is an apocalyptic number.

21374331 is a deficient number, since it is larger than the sum of its proper divisors (10379397).

21374331 is a wasteful number, since it uses less digits than its factorization.

21374331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842.

The product of its digits is 1512, while the sum is 24.

The square root of 21374331 is about 4623.2381509068. The cubic root of 21374331 is about 277.5220597673.

The spelling of 21374331 in words is "twenty-one million, three hundred seventy-four thousand, three hundred thirty-one".