21674331 has 16 divisors (see below), whose sum is σ = 36697600. Its totient is φ = 12385224.

The previous prime is 21674327. The next prime is 21674333. The reversal of 21674331 is 13347612.

It is not a de Polignac number, because 21674331 - 2² = 21674327 is a prime.

It is a super-2 number, since 2×21674331² = 939553248595122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21674295 and 21674304.

It is not an unprimeable number, because it can be changed into a prime (21674333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57151 + ... + 57528.

It is an arithmetic number, because the mean of its divisors is an integer number (2293600).

Almost surely, 2^21674331 is an apocalyptic number.

21674331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21674331 is a deficient number, since it is larger than the sum of its proper divisors (15023269).

21674331 is a wasteful number, since it uses less digits than its factorization.

21674331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114695 (or 114689 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21674331 is about 4655.5698899275. The cubic root of 21674331 is about 278.8144216230.

It can be divided in two parts, 216 and 74331, that added together give a palindrome (74547).

The spelling of 21674331 in words is "twenty-one million, six hundred seventy-four thousand, three hundred thirty-one".