25221423224 has 16 divisors (see below), whose sum is σ = 48443587920. Its totient is φ = 12303133120.

The previous prime is 25221423173. The next prime is 25221423263. The reversal of 25221423224 is 42232412252.

It is a happy number.

It is a super-2 number, since 2×25221423224² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38446964 + ... + 38447619.

It is an arithmetic number, because the mean of its divisors is an integer number (3027724245).

Almost surely, 2^25221423224 is an apocalyptic number.

It is an amenable number.

25221423224 is a deficient number, since it is larger than the sum of its proper divisors (23222164696).

25221423224 is a wasteful number, since it uses less digits than its factorization.

25221423224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76894630 (or 76894626 counting only the distinct ones).

The product of its digits is 15360, while the sum is 29.

Adding to 25221423224 its reverse (42232412252), we get a palindrome (67453835476).

The spelling of 25221423224 in words is "twenty-five billion, two hundred twenty-one million, four hundred twenty-three thousand, two hundred twenty-four".