21140056563 has 8 divisors (see below), whose sum is σ = 29844785808. Its totient is φ = 13264349184.

The previous prime is 21140056559. The next prime is 21140056571. The reversal of 21140056563 is 36565004112.

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

It is not a de Polignac number, because 21140056563 - 2² = 21140056559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21140056573) 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 in 7 ways as a sum of consecutive naturals, for example, 207255406 + ... + 207255507.

It is an arithmetic number, because the mean of its divisors is an integer number (3730598226).

Almost surely, 2^21140056563 is an apocalyptic number.

21140056563 is a deficient number, since it is larger than the sum of its proper divisors (8704729245).

21140056563 is a wasteful number, since it uses less digits than its factorization.

21140056563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414510933.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 21140056563 in words is "twenty-one billion, one hundred forty million, fifty-six thousand, five hundred sixty-three".