25450021 has 8 divisors (see below), whose sum is σ = 25907904. Its totient is φ = 24995040.

The previous prime is 25450013. The next prime is 25450027. The reversal of 25450021 is 12005452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25450021 - 2³ = 25450013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25450027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24121 + ... + 25153.

It is an arithmetic number, because the mean of its divisors is an integer number (3238488).

Almost surely, 2^25450021 is an apocalyptic number.

It is an amenable number.

25450021 is a deficient number, since it is larger than the sum of its proper divisors (457883).

25450021 is a wasteful number, since it uses less digits than its factorization.

25450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 25450021 is about 5044.8013836027. The cubic root of 25450021 is about 294.1458429228.

Adding to 25450021 its reverse (12005452), we get a palindrome (37455473).

The spelling of 25450021 in words is "twenty-five million, four hundred fifty thousand, twenty-one".