21236013443 has 2 divisors, whose sum is σ = 21236013444. Its totient is φ = 21236013442.

The previous prime is 21236013397. The next prime is 21236013467. The reversal of 21236013443 is 34431063212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21236013443 - 2¹⁰ = 21236012419 is a prime.

It is not a weakly prime, because it can be changed into another prime (21236013493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618006721 + 10618006722.

It is an arithmetic number, because the mean of its divisors is an integer number (10618006722).

Almost surely, 2^21236013443 is an apocalyptic number.

21236013443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21236013443 is an equidigital number, since it uses as much as digits as its factorization.

21236013443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21236013443 its reverse (34431063212), we get a palindrome (55667076655).

The spelling of 21236013443 in words is "twenty-one billion, two hundred thirty-six million, thirteen thousand, four hundred forty-three".