21120003313 has 2 divisors, whose sum is σ = 21120003314. Its totient is φ = 21120003312.

The previous prime is 21120003301. The next prime is 21120003319. The reversal of 21120003313 is 31330002112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21057782769 + 62220544 = 145113^2 + 7888^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120003313 - 2⁹ = 21120002801 is a prime.

It is a super-2 number, since 2×21120003313² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120003319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560001656 + 10560001657.

It is an arithmetic number, because the mean of its divisors is an integer number (10560001657).

Almost surely, 2^21120003313 is an apocalyptic number.

It is an amenable number.

21120003313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120003313 is an equidigital number, since it uses as much as digits as its factorization.

21120003313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21120003313 its reverse (31330002112), we get a palindrome (52450005425).

The spelling of 21120003313 in words is "twenty-one billion, one hundred twenty million, three thousand, three hundred thirteen".