21325404 has 24 divisors (see below), whose sum is σ = 50819328. Its totient is φ = 6957040.

The previous prime is 21325397. The next prime is 21325433. The reversal of 21325404 is 40452312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18342 + ... + 19469.

It is an arithmetic number, because the mean of its divisors is an integer number (2117472).

Almost surely, 2^21325404 is an apocalyptic number.

It is an amenable number.

21325404 is an abundant number, since it is smaller than the sum of its proper divisors (29493924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21325404 is a wasteful number, since it uses less digits than its factorization.

21325404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37865 (or 37863 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21325404 is about 4617.9436982276. The cubic root of 21325404 is about 277.3101436529.

Adding to 21325404 its reverse (40452312), we get a palindrome (61777716).

The spelling of 21325404 in words is "twenty-one million, three hundred twenty-five thousand, four hundred four".