21475349 has 8 divisors (see below), whose sum is σ = 25142208. Its totient is φ = 17958240.

The previous prime is 21475331. The next prime is 21475357. The reversal of 21475349 is 94357412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21475349 - 2²⁰ = 20426773 is a prime.

It is a super-2 number, since 2×21475349² = 922381229343602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475249) 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 7 ways as a sum of consecutive naturals, for example, 37127 + ... + 37700.

It is an arithmetic number, because the mean of its divisors is an integer number (3142776).

Almost surely, 2^21475349 is an apocalyptic number.

It is an amenable number.

21475349 is a deficient number, since it is larger than the sum of its proper divisors (3666859).

21475349 is an equidigital number, since it uses as much as digits as its factorization.

21475349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74875.

The product of its digits is 30240, while the sum is 35.

The square root of 21475349 is about 4634.1502996774. The cubic root of 21475349 is about 277.9585751640.

The spelling of 21475349 in words is "twenty-one million, four hundred seventy-five thousand, three hundred forty-nine".