21736578693 has 8 divisors (see below), whose sum is σ = 28983528288. Its totient is φ = 14490340784.

The previous prime is 21736578673. The next prime is 21736578719. The reversal of 21736578693 is 39687563712.

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 21736578693 - 2¹³ = 21736570501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21736578673) 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, 102030 + ... + 232127.

It is an arithmetic number, because the mean of its divisors is an integer number (3622941036).

Almost surely, 2^21736578693 is an apocalyptic number.

It is an amenable number.

21736578693 is a deficient number, since it is larger than the sum of its proper divisors (7246949595).

21736578693 is a wasteful number, since it uses less digits than its factorization.

21736578693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355843.

The product of its digits is 11430720, while the sum is 57.

The spelling of 21736578693 in words is "twenty-one billion, seven hundred thirty-six million, five hundred seventy-eight thousand, six hundred ninety-three".