21333111073 has 2 divisors, whose sum is σ = 21333111074. Its totient is φ = 21333111072.

The previous prime is 21333111047. The next prime is 21333111077. The reversal of 21333111073 is 37011133312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12381680529 + 8951430544 = 111273^2 + 94612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333111073 is a prime.

It is a super-2 number, since 2×21333111073² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21333111077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666555536 + 10666555537.

It is an arithmetic number, because the mean of its divisors is an integer number (10666555537).

Almost surely, 2^21333111073 is an apocalyptic number.

It is an amenable number.

21333111073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333111073 is an equidigital number, since it uses as much as digits as its factorization.

21333111073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

Adding to 21333111073 its reverse (37011133312), we get a palindrome (58344244385).

The spelling of 21333111073 in words is "twenty-one billion, three hundred thirty-three million, one hundred eleven thousand, seventy-three".