21242354443 has 2 divisors, whose sum is σ = 21242354444. Its totient is φ = 21242354442.

The previous prime is 21242354431. The next prime is 21242354447. The reversal of 21242354443 is 34445324212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21242354443 - 2¹⁷ = 21242223371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21242354399 and 21242354408.

It is not a weakly prime, because it can be changed into another prime (21242354447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621177221 + 10621177222.

It is an arithmetic number, because the mean of its divisors is an integer number (10621177222).

Almost surely, 2^21242354443 is an apocalyptic number.

21242354443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21242354443 is an equidigital number, since it uses as much as digits as its factorization.

21242354443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 34.

Adding to 21242354443 its reverse (34445324212), we get a palindrome (55687678655).

The spelling of 21242354443 in words is "twenty-one billion, two hundred forty-two million, three hundred fifty-four thousand, four hundred forty-three".