25400221 has 8 divisors (see below), whose sum is σ = 31667904. Its totient is φ = 19792320.

The previous prime is 25400171. The next prime is 25400233. The reversal of 25400221 is 12200452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25400221 - 2²³ = 17011613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25400195 and 25400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164860 + ... + 165013.

It is an arithmetic number, because the mean of its divisors is an integer number (3958488).

Almost surely, 2^25400221 is an apocalyptic number.

It is an amenable number.

25400221 is a deficient number, since it is larger than the sum of its proper divisors (6267683).

25400221 is a wasteful number, since it uses less digits than its factorization.

25400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329891.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25400221 is about 5039.8631925877. The cubic root of 25400221 is about 293.9538584320.

Adding to 25400221 its reverse (12200452), we get a palindrome (37600673).

The spelling of 25400221 in words is "twenty-five million, four hundred thousand, two hundred twenty-one".