25680121 has 8 divisors (see below), whose sum is σ = 27661824. Its totient is φ = 23770560.

The previous prime is 25680113. The next prime is 25680131. The reversal of 25680121 is 12108652.

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 25680121 - 2³ = 25680113 is a prime.

It is a super-2 number, since 2×25680121² = 1318937229149282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25680101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17296 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (3457728).

Almost surely, 2^25680121 is an apocalyptic number.

It is an amenable number.

25680121 is a deficient number, since it is larger than the sum of its proper divisors (1981703).

25680121 is a wasteful number, since it uses less digits than its factorization.

25680121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36071.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 25680121 is about 5067.5557224366. Note that the first 3 decimals coincide. The cubic root of 25680121 is about 295.0296666516.

Adding to 25680121 its reverse (12108652), we get a palindrome (37788773).

The spelling of 25680121 in words is "twenty-five million, six hundred eighty thousand, one hundred twenty-one".