21325245 has 16 divisors (see below), whose sum is σ = 34181952. Its totient is φ = 11352960.

The previous prime is 21325219. The next prime is 21325279. The reversal of 21325245 is 54252312.

It is not a de Polignac number, because 21325245 - 2⁹ = 21324733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11289 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (2136372).

Almost surely, 2^21325245 is an apocalyptic number.

It is an amenable number.

21325245 is a deficient number, since it is larger than the sum of its proper divisors (12856707).

21325245 is a wasteful number, since it uses less digits than its factorization.

21325245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572.

The product of its digits is 2400, while the sum is 24.

The square root of 21325245 is about 4617.9264827409. The cubic root of 21325245 is about 277.3094544527.

Adding to 21325245 its reverse (54252312), we get a palindrome (75577557).

The spelling of 21325245 in words is "twenty-one million, three hundred twenty-five thousand, two hundred forty-five".