21534489813 has 8 divisors (see below), whose sum is σ = 28714708800. Its totient is φ = 14355298688.

The previous prime is 21534489797. The next prime is 21534489859. The reversal of 21534489813 is 31898443512.

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 21534489813 - 2⁴ = 21534489797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534489113) 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, 206673 + ... + 292886.

It is an arithmetic number, because the mean of its divisors is an integer number (3589338600).

Almost surely, 2^21534489813 is an apocalyptic number.

It is an amenable number.

21534489813 is a deficient number, since it is larger than the sum of its proper divisors (7180218987).

21534489813 is a wasteful number, since it uses less digits than its factorization.

21534489813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513931.

The product of its digits is 829440, while the sum is 48.

The spelling of 21534489813 in words is "twenty-one billion, five hundred thirty-four million, four hundred eighty-nine thousand, eight hundred thirteen".