21932578117 has 4 divisors (see below), whose sum is σ = 22133794540. Its totient is φ = 21731361696.

The previous prime is 21932578099. The next prime is 21932578127. The reversal of 21932578117 is 71187523912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19291543236 + 2641034881 = 138894^2 + 51391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21932578117 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 (21932578127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100608048 + ... + 100608265.

It is an arithmetic number, because the mean of its divisors is an integer number (5533448635).

Almost surely, 2^21932578117 is an apocalyptic number.

It is an amenable number.

21932578117 is a deficient number, since it is larger than the sum of its proper divisors (201216423).

21932578117 is a wasteful number, since it uses less digits than its factorization.

21932578117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201216422.

The product of its digits is 211680, while the sum is 46.

The spelling of 21932578117 in words is "twenty-one billion, nine hundred thirty-two million, five hundred seventy-eight thousand, one hundred seventeen".