21450542063 has 8 divisors (see below), whose sum is σ = 21501032688. Its totient is φ = 21400111744.

The previous prime is 21450542059. The next prime is 21450542083. The reversal of 21450542063 is 36024505412.

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 21450542063 - 2² = 21450542059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450542033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741020 + ... + 769422.

It is an arithmetic number, because the mean of its divisors is an integer number (2687629086).

Almost surely, 2^21450542063 is an apocalyptic number.

21450542063 is a deficient number, since it is larger than the sum of its proper divisors (50490625).

21450542063 is an equidigital number, since it uses as much as digits as its factorization.

21450542063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30153.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 21450542063 in words is "twenty-one billion, four hundred fifty million, five hundred forty-two thousand, sixty-three".