21274353 has 8 divisors (see below), whose sum is σ = 31517600. Its totient is φ = 14182884.

The previous prime is 21274349. The next prime is 21274373. The reversal of 21274353 is 35347212.

It is not a de Polignac number, because 21274353 - 2² = 21274349 is a prime.

It is a super-4 number, since 4×21274353⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 787939 = 21274353 / (2 + 1 + 2 + 7 + 4 + 3 + 5 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21274343) 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 7 ways as a sum of consecutive naturals, for example, 393943 + ... + 393996.

It is an arithmetic number, because the mean of its divisors is an integer number (3939700).

Almost surely, 2^21274353 is an apocalyptic number.

It is an amenable number.

21274353 is a deficient number, since it is larger than the sum of its proper divisors (10243247).

21274353 is an equidigital number, since it uses as much as digits as its factorization.

21274353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787948 (or 787942 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21274353 is about 4612.4129260074. The cubic root of 21274353 is about 277.0886820884.

The spelling of 21274353 in words is "twenty-one million, two hundred seventy-four thousand, three hundred fifty-three".