21383465 has 4 divisors (see below), whose sum is σ = 25660164. Its totient is φ = 17106768.

The previous prime is 21383441. The next prime is 21383473. The reversal of 21383465 is 56438312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14115049 + 7268416 = 3757^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 21383465 - 2⁸ = 21383209 is a prime.

It is a super-3 number, since 3×21383465³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138342 + ... + 2138351.

It is an arithmetic number, because the mean of its divisors is an integer number (6415041).

Almost surely, 2^21383465 is an apocalyptic number.

It is an amenable number.

21383465 is a deficient number, since it is larger than the sum of its proper divisors (4276699).

21383465 is an equidigital number, since it uses as much as digits as its factorization.

21383465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276698.

The product of its digits is 17280, while the sum is 32.

The square root of 21383465 is about 4624.2258811611. The cubic root of 21383465 is about 277.5615857685.

The spelling of 21383465 in words is "twenty-one million, three hundred eighty-three thousand, four hundred sixty-five".