25319021 has 16 divisors (see below), whose sum is σ = 32519424. Its totient is φ = 19160064.

The previous prime is 25319011. The next prime is 25319027. The reversal of 25319021 is 12091352.

It is not a de Polignac number, because 25319021 - 2¹⁰ = 25317997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25319027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3956 + ... + 8141.

It is an arithmetic number, because the mean of its divisors is an integer number (2032464).

Almost surely, 2^25319021 is an apocalyptic number.

It is an amenable number.

25319021 is a deficient number, since it is larger than the sum of its proper divisors (7200403).

25319021 is a wasteful number, since it uses less digits than its factorization.

25319021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12140.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 25319021 is about 5031.8009698318. The cubic root of 25319021 is about 293.6402846037.

The spelling of 25319021 in words is "twenty-five million, three hundred nineteen thousand, twenty-one".