21274371 has 24 divisors (see below), whose sum is σ = 32663280. Its totient is φ = 13317696.

The previous prime is 21274349. The next prime is 21274373. The reversal of 21274371 is 17347212.

It is a happy number.

21274371 is a `hidden beast` number, since 21 + 274 + 371 = 666.

It is not a de Polignac number, because 21274371 - 2⁶ = 21274307 is a prime.

It is a super-2 number, since 2×21274371² = 905197722891282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21274373) 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 23 ways as a sum of consecutive naturals, for example, 8556 + ... + 10758.

It is an arithmetic number, because the mean of its divisors is an integer number (1360970).

Almost surely, 2^21274371 is an apocalyptic number.

21274371 is a deficient number, since it is larger than the sum of its proper divisors (11388909).

21274371 is a wasteful number, since it uses less digits than its factorization.

21274371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275 (or 2272 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 21274371 is about 4612.4148772633. The cubic root of 21274371 is about 277.0887602357.

The spelling of 21274371 in words is "twenty-one million, two hundred seventy-four thousand, three hundred seventy-one".