22494430421 has 2 divisors, whose sum is σ = 22494430422. Its totient is φ = 22494430420.

The previous prime is 22494430403. The next prime is 22494430463. The reversal of 22494430421 is 12403449422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22431052900 + 63377521 = 149770^2 + 7961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22494430421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22494430471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11247215210 + 11247215211.

It is an arithmetic number, because the mean of its divisors is an integer number (11247215211).

Almost surely, 2^22494430421 is an apocalyptic number.

It is an amenable number.

22494430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22494430421 is an equidigital number, since it uses as much as digits as its factorization.

22494430421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 35.

Adding to 22494430421 its reverse (12403449422), we get a palindrome (34897879843).

The spelling of 22494430421 in words is "twenty-two billion, four hundred ninety-four million, four hundred thirty thousand, four hundred twenty-one".