21113433443 has 2 divisors, whose sum is σ = 21113433444. Its totient is φ = 21113433442.

The previous prime is 21113433427. The next prime is 21113433503. The reversal of 21113433443 is 34433431112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113433443 - 2⁴ = 21113433427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113433043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556716721 + 10556716722.

It is an arithmetic number, because the mean of its divisors is an integer number (10556716722).

Almost surely, 2^21113433443 is an apocalyptic number.

21113433443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113433443 is an equidigital number, since it uses as much as digits as its factorization.

21113433443 is an evil number, because the sum of its binary digits is even.

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

Adding to 21113433443 its reverse (34433431112), we get a palindrome (55546864555).

The spelling of 21113433443 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred forty-three".