25520121 has 24 divisors (see below), whose sum is σ = 41306304. Its totient is φ = 15046560.

The previous prime is 25520071. The next prime is 25520123. The reversal of 25520121 is 12102552.

25520121 is a `hidden beast` number, since 25 + 520 + 121 = 666.

It is not a de Polignac number, because 25520121 - 2⁷ = 25519993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25520094 and 25520103.

It is not an unprimeable number, because it can be changed into a prime (25520123) 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, 180 + ... + 7146.

It is an arithmetic number, because the mean of its divisors is an integer number (1721096).

Almost surely, 2^25520121 is an apocalyptic number.

It is an amenable number.

25520121 is a deficient number, since it is larger than the sum of its proper divisors (15786183).

25520121 is a wasteful number, since it uses less digits than its factorization.

25520121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021 (or 7018 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 25520121 is about 5051.7443522015. The cubic root of 25520121 is about 294.4156622262.

Adding to 25520121 its reverse (12102552), we get a palindrome (37622673).

Subtracting from 25520121 its reverse (12102552), we obtain a square (13417569 = 3663²).

The spelling of 25520121 in words is "twenty-five million, five hundred twenty thousand, one hundred twenty-one".