25521342 has 64 divisors (see below), whose sum is σ = 65401344. Its totient is φ = 6445440.

The previous prime is 25521337. The next prime is 25521343. The reversal of 25521342 is 24312552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16348 + ... + 17840.

It is an arithmetic number, because the mean of its divisors is an integer number (1021896).

Almost surely, 2^25521342 is an apocalyptic number.

25521342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25521342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32700672).

25521342 is an abundant number, since it is smaller than the sum of its proper divisors (39880002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25521342 is a wasteful number, since it uses less digits than its factorization.

25521342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553.

The product of its digits is 2400, while the sum is 24.

The square root of 25521342 is about 5051.8652001018. The cubic root of 25521342 is about 294.4203575513.

Adding to 25521342 its reverse (24312552), we get a palindrome (49833894).

It can be divided in two parts, 255213 and 42, that added together give a triangular number (255255 = T₇₁₄).

The spelling of 25521342 in words is "twenty-five million, five hundred twenty-one thousand, three hundred forty-two".