16721253503 has 2 divisors, whose sum is σ = 16721253504. Its totient is φ = 16721253502.

The previous prime is 16721253481. The next prime is 16721253511. The reversal of 16721253503 is 30535212761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16721253503 - 2²⁴ = 16704476287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721253553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360626751 + 8360626752.

It is an arithmetic number, because the mean of its divisors is an integer number (8360626752).

Almost surely, 2^16721253503 is an apocalyptic number.

16721253503 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721253503 is an equidigital number, since it uses as much as digits as its factorization.

16721253503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 16721253503 in words is "sixteen billion, seven hundred twenty-one million, two hundred fifty-three thousand, five hundred three".