25542021 has 16 divisors (see below), whose sum is σ = 34663680. Its totient is φ = 16727040.

The previous prime is 25542001. The next prime is 25542031. The reversal of 25542021 is 12024552.

It is a happy number.

It is not a de Polignac number, because 25542021 - 2¹¹ = 25539973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25542001) 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 15 ways as a sum of consecutive naturals, for example, 72181 + ... + 72533.

It is an arithmetic number, because the mean of its divisors is an integer number (2166480).

Almost surely, 2^25542021 is an apocalyptic number.

It is an amenable number.

25542021 is a deficient number, since it is larger than the sum of its proper divisors (9121659).

25542021 is a wasteful number, since it uses less digits than its factorization.

25542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25542021 is about 5053.9114554966. The cubic root of 25542021 is about 294.4998553945.

Adding to 25542021 its reverse (12024552), we get a palindrome (37566573).

The spelling of 25542021 in words is "twenty-five million, five hundred forty-two thousand, twenty-one".