25367821 has 4 divisors (see below), whose sum is σ = 25387072. Its totient is φ = 25348572.

The previous prime is 25367819. The next prime is 25367843. The reversal of 25367821 is 12876352.

It is a happy number.

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 25367821 - 2¹ = 25367819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25367851) 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, 7491 + ... + 10336.

It is an arithmetic number, because the mean of its divisors is an integer number (6346768).

Almost surely, 2^25367821 is an apocalyptic number.

It is an amenable number.

25367821 is a deficient number, since it is larger than the sum of its proper divisors (19251).

25367821 is a wasteful number, since it uses less digits than its factorization.

25367821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19250.

The product of its digits is 20160, while the sum is 34.

The square root of 25367821 is about 5036.6477939201. The cubic root of 25367821 is about 293.8288180833.

The spelling of 25367821 in words is "twenty-five million, three hundred sixty-seven thousand, eight hundred twenty-one".