21461325 has 24 divisors (see below), whose sum is σ = 36072096. Its totient is φ = 11256000.

The previous prime is 21461287. The next prime is 21461329. The reversal of 21461325 is 52316412.

It is not a de Polignac number, because 21461325 - 2²² = 17267021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21461295 and 21461304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2230 + ... + 6920.

It is an arithmetic number, because the mean of its divisors is an integer number (1503004).

Almost surely, 2^21461325 is an apocalyptic number.

21461325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21461325 is a deficient number, since it is larger than the sum of its proper divisors (14610771).

21461325 is a wasteful number, since it uses less digits than its factorization.

21461325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4760 counting only the distinct ones).

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

The square root of 21461325 is about 4632.6369380732. The cubic root of 21461325 is about 277.8980570961.

Adding to 21461325 its reverse (52316412), we get a palindrome (73777737).

The spelling of 21461325 in words is "twenty-one million, four hundred sixty-one thousand, three hundred twenty-five".