21103113032773 has 2 divisors, whose sum is σ = 21103113032774. Its totient is φ = 21103113032772.

The previous prime is 21103113032717. The next prime is 21103113032779. The reversal of 21103113032773 is 37723031130112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21091037880004 + 12075152769 = 4592498^2 + 109887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103113032773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103113032779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551556516386 + 10551556516387.

It is an arithmetic number, because the mean of its divisors is an integer number (10551556516387).

Almost surely, 2^{21103113032773} is an apocalyptic number.

It is an amenable number.

21103113032773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103113032773 is an equidigital number, since it uses as much as digits as its factorization.

21103113032773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 34.

Adding to 21103113032773 its reverse (37723031130112), we get a palindrome (58826144162885).

The spelling of 21103113032773 in words is "twenty-one trillion, one hundred three billion, one hundred thirteen million, thirty-two thousand, seven hundred seventy-three".