25221225111 has 4 divisors (see below), whose sum is σ = 33628300152. Its totient is φ = 16814150072.

The previous prime is 25221225103. The next prime is 25221225149. The reversal of 25221225111 is 11152212252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25221225111 - 2³ = 25221225103 is a prime.

It is a super-2 number, since 2×25221225111² (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 (25221225101) 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, 4203537516 + ... + 4203537521.

It is an arithmetic number, because the mean of its divisors is an integer number (8407075038).

Almost surely, 2^25221225111 is an apocalyptic number.

25221225111 is a deficient number, since it is larger than the sum of its proper divisors (8407075041).

25221225111 is an equidigital number, since it uses as much as digits as its factorization.

25221225111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8407075040.

The product of its digits is 800, while the sum is 24.

Adding to 25221225111 its reverse (11152212252), we get a palindrome (36373437363).

The spelling of 25221225111 in words is "twenty-five billion, two hundred twenty-one million, two hundred twenty-five thousand, one hundred eleven".