25242021 has 24 divisors (see below), whose sum is σ = 42092544. Its totient is φ = 14277600.

The previous prime is 25242011. The next prime is 25242031. The reversal of 25242021 is 12024252.

It is an interprime number because it is at equal distance from previous prime (25242011) and next prime (25242031).

It is not a de Polignac number, because 25242021 - 2¹⁵ = 25209253 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25241985 and 25242003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25242011) 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, 4380 + ... + 8346.

It is an arithmetic number, because the mean of its divisors is an integer number (1753856).

Almost surely, 2^25242021 is an apocalyptic number.

25242021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25242021 is a deficient number, since it is larger than the sum of its proper divisors (16850523).

25242021 is a wasteful number, since it uses less digits than its factorization.

25242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081 (or 4078 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25242021 is about 5024.1438076552. The cubic root of 25242021 is about 293.3423101879.

Adding to 25242021 its reverse (12024252), we get a palindrome (37266273).

The spelling of 25242021 in words is "twenty-five million, two hundred forty-two thousand, twenty-one".