21133444043 has 2 divisors, whose sum is σ = 21133444044. Its totient is φ = 21133444042.

The previous prime is 21133444019. The next prime is 21133444063. The reversal of 21133444043 is 34044433112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21133444043 - 2⁸ = 21133443787 is a prime.

It is a super-2 number, since 2×21133444043² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133443997 and 21133444015.

It is not a weakly prime, because it can be changed into another prime (21133444063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566722021 + 10566722022.

It is an arithmetic number, because the mean of its divisors is an integer number (10566722022).

Almost surely, 2^21133444043 is an apocalyptic number.

21133444043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133444043 is an equidigital number, since it uses as much as digits as its factorization.

21133444043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21133444043 its reverse (34044433112), we get a palindrome (55177877155).

The spelling of 21133444043 in words is "twenty-one billion, one hundred thirty-three million, four hundred forty-four thousand, forty-three".