21033103331 has 2 divisors, whose sum is σ = 21033103332. Its totient is φ = 21033103330.

The previous prime is 21033103321. The next prime is 21033103367. The reversal of 21033103331 is 13330133012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21033103331 - 2¹⁴ = 21033086947 is a prime.

It is a super-2 number, since 2×21033103331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21033103321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516551665 + 10516551666.

It is an arithmetic number, because the mean of its divisors is an integer number (10516551666).

Almost surely, 2^21033103331 is an apocalyptic number.

21033103331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033103331 is an equidigital number, since it uses as much as digits as its factorization.

21033103331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21033103331 its reverse (13330133012), we get a palindrome (34363236343).

The spelling of 21033103331 in words is "twenty-one billion, thirty-three million, one hundred three thousand, three hundred thirty-one".