21003066113 has 2 divisors, whose sum is σ = 21003066114. Its totient is φ = 21003066112.

The previous prime is 21003065989. The next prime is 21003066137. The reversal of 21003066113 is 31166030012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18898825729 + 2104240384 = 137473^2 + 45872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003066113 is a prime.

It is a super-2 number, since 2×21003066113² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003066713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501533056 + 10501533057.

It is an arithmetic number, because the mean of its divisors is an integer number (10501533057).

Almost surely, 2^21003066113 is an apocalyptic number.

It is an amenable number.

21003066113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003066113 is an equidigital number, since it uses as much as digits as its factorization.

21003066113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21003066113 its reverse (31166030012), we get a palindrome (52169096125).

The spelling of 21003066113 in words is "twenty-one billion, three million, sixty-six thousand, one hundred thirteen".