21011233013 has 2 divisors, whose sum is σ = 21011233014. Its totient is φ = 21011233012.

The previous prime is 21011233007. The next prime is 21011233043. The reversal of 21011233013 is 31033211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20027344324 + 983888689 = 141518^2 + 31367^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011233013 - 2²² = 21007038709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011232982 and 21011233000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011233043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505616506 + 10505616507.

It is an arithmetic number, because the mean of its divisors is an integer number (10505616507).

Almost surely, 2^21011233013 is an apocalyptic number.

It is an amenable number.

21011233013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011233013 is an equidigital number, since it uses as much as digits as its factorization.

21011233013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21011233013 its reverse (31033211012), we get a palindrome (52044444025).

The spelling of 21011233013 in words is "twenty-one billion, eleven million, two hundred thirty-three thousand, thirteen".