21814371 has 12 divisors (see below), whose sum is σ = 31942248. Its totient is φ = 14343264.

The previous prime is 21814369. The next prime is 21814379. The reversal of 21814371 is 17341812.

It is not a de Polignac number, because 21814371 - 2¹ = 21814369 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21814379) 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 11 ways as a sum of consecutive naturals, for example, 15945 + ... + 17258.

It is an arithmetic number, because the mean of its divisors is an integer number (2661854).

Almost surely, 2^21814371 is an apocalyptic number.

21814371 is a deficient number, since it is larger than the sum of its proper divisors (10127877).

21814371 is a wasteful number, since it uses less digits than its factorization.

21814371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33282 (or 33279 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 21814371 is about 4670.5857234398. The cubic root of 21814371 is about 279.4136155202.

The spelling of 21814371 in words is "twenty-one million, eight hundred fourteen thousand, three hundred seventy-one".