21393465 has 8 divisors (see below), whose sum is σ = 34229568. Its totient is φ = 11409840.

The previous prime is 21393461. The next prime is 21393467. The reversal of 21393465 is 56439312.

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

It is not a de Polignac number, because 21393465 - 2² = 21393461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21393461) 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, 713101 + ... + 713130.

It is an arithmetic number, because the mean of its divisors is an integer number (4278696).

Almost surely, 2^21393465 is an apocalyptic number.

It is an amenable number.

21393465 is a deficient number, since it is larger than the sum of its proper divisors (12836103).

21393465 is a wasteful number, since it uses less digits than its factorization.

21393465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426239.

The product of its digits is 19440, while the sum is 33.

The square root of 21393465 is about 4625.3070168368. The cubic root of 21393465 is about 277.6048463485.

The spelling of 21393465 in words is "twenty-one million, three hundred ninety-three thousand, four hundred sixty-five".