22421252551 has 4 divisors (see below), whose sum is σ = 22424395104. Its totient is φ = 22418110000.

The previous prime is 22421252543. The next prime is 22421252561. The reversal of 22421252551 is 15525212422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15525212422 = 2 ⋅7762606211.

It is a cyclic number.

It is not a de Polignac number, because 22421252551 - 2³ = 22421252543 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421252521) by changing a digit.

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, 1560550 + ... + 1574851.

It is an arithmetic number, because the mean of its divisors is an integer number (5606098776).

Almost surely, 2^22421252551 is an apocalyptic number.

22421252551 is a deficient number, since it is larger than the sum of its proper divisors (3142553).

22421252551 is an equidigital number, since it uses as much as digits as its factorization.

22421252551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142552.

The product of its digits is 16000, while the sum is 31.

Adding to 22421252551 its reverse (15525212422), we get a palindrome (37946464973).

The spelling of 22421252551 in words is "twenty-two billion, four hundred twenty-one million, two hundred fifty-two thousand, five hundred fifty-one".