21503484571 has 2 divisors, whose sum is σ = 21503484572. Its totient is φ = 21503484570.

The previous prime is 21503484551. The next prime is 21503484641. The reversal of 21503484571 is 17548430512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21503484571 - 2¹¹ = 21503482523 is a prime.

It is not a weakly prime, because it can be changed into another prime (21503484551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751742285 + 10751742286.

It is an arithmetic number, because the mean of its divisors is an integer number (10751742286).

Almost surely, 2^21503484571 is an apocalyptic number.

21503484571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21503484571 is an equidigital number, since it uses as much as digits as its factorization.

21503484571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 21503484571 in words is "twenty-one billion, five hundred three million, four hundred eighty-four thousand, five hundred seventy-one".