21348325 has 6 divisors (see below), whose sum is σ = 26471954. Its totient is φ = 17078640.

The previous prime is 21348323. The next prime is 21348329. The reversal of 21348325 is 52384312.

It can be written as a sum of positive squares in 3 ways, for example, as 1572516 + 19775809 = 1254^2 + 4447^2 .

It is not a de Polignac number, because 21348325 - 2¹ = 21348323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21348293 and 21348302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426942 + ... + 426991.

Almost surely, 2^21348325 is an apocalyptic number.

21348325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21348325 is a deficient number, since it is larger than the sum of its proper divisors (5123629).

21348325 is an equidigital number, since it uses as much as digits as its factorization.

21348325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853943 (or 853938 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21348325 is about 4620.4247640233. The cubic root of 21348325 is about 277.4094610350.

The spelling of 21348325 in words is "twenty-one million, three hundred forty-eight thousand, three hundred twenty-five".