25205414421 has 32 divisors (see below), whose sum is σ = 39320225280. Its totient is φ = 14198932800.

The previous prime is 25205414419. The next prime is 25205414431. The reversal of 25205414421 is 12441450252.

It is not a de Polignac number, because 25205414421 - 2¹ = 25205414419 is a prime.

It is a super-2 number, since 2×25205414421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25205414431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 346015 + ... + 412476.

It is an arithmetic number, because the mean of its divisors is an integer number (1228757040).

Almost surely, 2^25205414421 is an apocalyptic number.

It is an amenable number.

25205414421 is a deficient number, since it is larger than the sum of its proper divisors (14114810859).

25205414421 is a wasteful number, since it uses less digits than its factorization.

25205414421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758577.

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 25205414421 its reverse (12441450252), we get a palindrome (37646864673).

The spelling of 25205414421 in words is "twenty-five billion, two hundred five million, four hundred fourteen thousand, four hundred twenty-one".