21471353 has 4 divisors (see below), whose sum is σ = 21730128. Its totient is φ = 21212580.

The previous prime is 21471341. The next prime is 21471367. The reversal of 21471353 is 35317412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21471353 - 2⁴ = 21471337 is a prime.

It is a super-2 number, since 2×21471353² = 922037999301218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21471383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129263 + ... + 129428.

It is an arithmetic number, because the mean of its divisors is an integer number (5432532).

Almost surely, 2^21471353 is an apocalyptic number.

It is an amenable number.

21471353 is a deficient number, since it is larger than the sum of its proper divisors (258775).

21471353 is an equidigital number, since it uses as much as digits as its factorization.

21471353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258774.

The product of its digits is 2520, while the sum is 26.

The square root of 21471353 is about 4633.7191326191. The cubic root of 21471353 is about 277.9413338242.

Adding to 21471353 its reverse (35317412), we get a palindrome (56788765).

The spelling of 21471353 in words is "twenty-one million, four hundred seventy-one thousand, three hundred fifty-three".