22451220442 has 64 divisors (see below), whose sum is σ = 41365209600. Its totient is φ = 8920590336.

The previous prime is 22451220433. The next prime is 22451220443. The reversal of 22451220442 is 24402215422.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22451220442.

It is not an unprimeable number, because it can be changed into a prime (22451220443) 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, 4826934 + ... + 4831582.

It is an arithmetic number, because the mean of its divisors is an integer number (646331400).

Almost surely, 2^22451220442 is an apocalyptic number.

22451220442 is a deficient number, since it is larger than the sum of its proper divisors (18913989158).

22451220442 is a wasteful number, since it uses less digits than its factorization.

22451220442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975.

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 22451220442 its reverse (24402215422), we get a palindrome (46853435864).

The spelling of 22451220442 in words is "twenty-two billion, four hundred fifty-one million, two hundred twenty thousand, four hundred forty-two".