25016421 has 8 divisors (see below), whose sum is σ = 33378784. Its totient is φ = 16665840.

The previous prime is 25016399. The next prime is 25016423. The reversal of 25016421 is 12461052.

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

It is not a de Polignac number, because 25016421 - 2⁵ = 25016389 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 (25016423) 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, 5355 + ... + 8871.

It is an arithmetic number, because the mean of its divisors is an integer number (4172348).

Almost surely, 2^25016421 is an apocalyptic number.

It is an amenable number.

25016421 is a deficient number, since it is larger than the sum of its proper divisors (8362363).

25016421 is a wasteful number, since it uses less digits than its factorization.

25016421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 25016421 is about 5001.6418304393. The cubic root of 25016421 is about 292.4657802031.

Adding to 25016421 its reverse (12461052), we get a palindrome (37477473).

The spelling of 25016421 in words is "twenty-five million, sixteen thousand, four hundred twenty-one".