21113111203313 has 2 divisors, whose sum is σ = 21113111203314. Its totient is φ = 21113111203312.

The previous prime is 21113111203307. The next prime is 21113111203321. The reversal of 21113111203313 is 31330211131112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11626415521009 + 9486695682304 = 3409753^2 + 3080048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113111203313 - 2¹⁴ = 21113111186929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113111203813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556555601656 + 10556555601657.

It is an arithmetic number, because the mean of its divisors is an integer number (10556555601657).

Almost surely, 2^{21113111203313} is an apocalyptic number.

It is an amenable number.

21113111203313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113111203313 is an equidigital number, since it uses as much as digits as its factorization.

21113111203313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 21113111203313 its reverse (31330211131112), we get a palindrome (52443322334425).

The spelling of 21113111203313 in words is "twenty-one trillion, one hundred thirteen billion, one hundred eleven million, two hundred three thousand, three hundred thirteen".