21325461 has 4 divisors (see below), whose sum is σ = 28433952. Its totient is φ = 14216972.

The previous prime is 21325457. The next prime is 21325471. The reversal of 21325461 is 16452312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21325461 - 2² = 21325457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554241 + ... + 3554246.

It is an arithmetic number, because the mean of its divisors is an integer number (7108488).

Almost surely, 2^21325461 is an apocalyptic number.

It is an amenable number.

21325461 is a deficient number, since it is larger than the sum of its proper divisors (7108491).

21325461 is an equidigital number, since it uses as much as digits as its factorization.

21325461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108490.

The product of its digits is 1440, while the sum is 24.

The square root of 21325461 is about 4617.9498698015. The cubic root of 21325461 is about 277.3103907239.

Adding to 21325461 its reverse (16452312), we get a palindrome (37777773).

The spelling of 21325461 in words is "twenty-one million, three hundred twenty-five thousand, four hundred sixty-one".