21031223013103 has 2 divisors, whose sum is σ = 21031223013104. Its totient is φ = 21031223013102.

The previous prime is 21031223013089. The next prime is 21031223013173. The reversal of 21031223013103 is 30131032213012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031223013103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031223013173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515611506551 + 10515611506552.

It is an arithmetic number, because the mean of its divisors is an integer number (10515611506552).

Almost surely, 2^{21031223013103} is an apocalyptic number.

21031223013103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031223013103 is an equidigital number, since it uses as much as digits as its factorization.

21031223013103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21031223013103 its reverse (30131032213012), we get a palindrome (51162255226115).

The spelling of 21031223013103 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-three million, thirteen thousand, one hundred three".