21534510683 has 8 divisors (see below), whose sum is σ = 24828665568. Its totient is φ = 18294804864.

The previous prime is 21534510671. The next prime is 21534510707. The reversal of 21534510683 is 38601543512.

It is a happy number.

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

It is not a de Polignac number, because 21534510683 - 2¹⁸ = 21534248539 is a prime.

It is a super-2 number, since 2×21534510683² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21534515683) 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, 13611416 + ... + 13612997.

It is an arithmetic number, because the mean of its divisors is an integer number (3103583196).

Almost surely, 2^21534510683 is an apocalyptic number.

21534510683 is a deficient number, since it is larger than the sum of its proper divisors (3294154885).

21534510683 is a wasteful number, since it uses less digits than its factorization.

21534510683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27224533.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21534510683 in words is "twenty-one billion, five hundred thirty-four million, five hundred ten thousand, six hundred eighty-three".