21502355550503 has 2 divisors, whose sum is σ = 21502355550504. Its totient is φ = 21502355550502.

The previous prime is 21502355550457. The next prime is 21502355550517. The reversal of 21502355550503 is 30505555320512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21502355550503 - 2²⁴ = 21502338773287 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21502355550103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751177775251 + 10751177775252.

It is an arithmetic number, because the mean of its divisors is an integer number (10751177775252).

Almost surely, 2^{21502355550503} is an apocalyptic number.

21502355550503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21502355550503 is an equidigital number, since it uses as much as digits as its factorization.

21502355550503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 562500, while the sum is 41.

The spelling of 21502355550503 in words is "twenty-one trillion, five hundred two billion, three hundred fifty-five million, five hundred fifty thousand, five hundred three".