21157710563 has 8 divisors (see below), whose sum is σ = 23082209280. Its totient is φ = 19233390280.

The previous prime is 21157710443. The next prime is 21157710569. The reversal of 21157710563 is 36501775112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21157710563 - 2³⁰ = 20083968739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21157710569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374906 + ... + 427632.

It is an arithmetic number, because the mean of its divisors is an integer number (2885276160).

Almost surely, 2^21157710563 is an apocalyptic number.

21157710563 is a deficient number, since it is larger than the sum of its proper divisors (1924498717).

21157710563 is a wasteful number, since it uses less digits than its factorization.

21157710563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89217.

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 21157710563 in words is "twenty-one billion, one hundred fifty-seven million, seven hundred ten thousand, five hundred sixty-three".