25221452105 has 32 divisors (see below), whose sum is σ = 31626547200. Its totient is φ = 19285039872.

The previous prime is 25221452089. The next prime is 25221452117. The reversal of 25221452105 is 50125412252.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25221452105 - 2⁴ = 25221452089 is a prime.

It is a super-2 number, since 2×25221452105² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6355832 + ... + 6359798.

It is an arithmetic number, because the mean of its divisors is an integer number (988329600).

Almost surely, 2^25221452105 is an apocalyptic number.

It is an amenable number.

25221452105 is a deficient number, since it is larger than the sum of its proper divisors (6405095095).

25221452105 is a wasteful number, since it uses less digits than its factorization.

25221452105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4433.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 25221452105 its reverse (50125412252), we get a palindrome (75346864357).

The spelling of 25221452105 in words is "twenty-five billion, two hundred twenty-one million, four hundred fifty-two thousand, one hundred five".