21223061321503 has 2 divisors, whose sum is σ = 21223061321504. Its totient is φ = 21223061321502.

The previous prime is 21223061321479. The next prime is 21223061321557. The reversal of 21223061321503 is 30512316032212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223061321503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223061322503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611530660751 + 10611530660752.

It is an arithmetic number, because the mean of its divisors is an integer number (10611530660752).

Almost surely, 2^{21223061321503} is an apocalyptic number.

21223061321503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223061321503 is an equidigital number, since it uses as much as digits as its factorization.

21223061321503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 21223061321503 its reverse (30512316032212), we get a palindrome (51735377353715).

The spelling of 21223061321503 in words is "twenty-one trillion, two hundred twenty-three billion, sixty-one million, three hundred twenty-one thousand, five hundred three".