25111421 has 4 divisors (see below), whose sum is σ = 25222272. Its totient is φ = 25000572.

The previous prime is 25111409. The next prime is 25111433. The reversal of 25111421 is 12411152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (25111409) and next prime (25111433).

It is a cyclic number.

It is not a de Polignac number, because 25111421 - 2¹⁸ = 24849277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25111421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25111621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55085 + ... + 55538.

It is an arithmetic number, because the mean of its divisors is an integer number (6305568).

Almost surely, 2^25111421 is an apocalyptic number.

It is an amenable number.

25111421 is a deficient number, since it is larger than the sum of its proper divisors (110851).

25111421 is a wasteful number, since it uses less digits than its factorization.

25111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110850.

The product of its digits is 80, while the sum is 17.

The square root of 25111421 is about 5011.1297129490. The cubic root of 25111421 is about 292.8355260439.

Adding to 25111421 its reverse (12411152), we get a palindrome (37522573).

The spelling of 25111421 in words is "twenty-five million, one hundred eleven thousand, four hundred twenty-one".