21389395 has 8 divisors (see below), whose sum is σ = 25711056. Its totient is φ = 17082336.

The previous prime is 21389393. The next prime is 21389419. The reversal of 21389395 is 59398312.

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 21389395 - 2¹ = 21389393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21389393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (3213882).

Almost surely, 2^21389395 is an apocalyptic number.

21389395 is a deficient number, since it is larger than the sum of its proper divisors (4321661).

21389395 is an equidigital number, since it uses as much as digits as its factorization.

21389395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7301.

The product of its digits is 58320, while the sum is 40.

The square root of 21389395 is about 4624.8670251154. The cubic root of 21389395 is about 277.5872409196.

The spelling of 21389395 in words is "twenty-one million, three hundred eighty-nine thousand, three hundred ninety-five".