21932495693 has 4 divisors (see below), whose sum is σ = 21988877820. Its totient is φ = 21876113568.

The previous prime is 21932495681. The next prime is 21932495699. The reversal of 21932495693 is 39659423912.

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 1930899364 + 20001596329 = 43942^2 + 141427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21932495693 - 2¹⁰ = 21932494669 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 (21932495699) 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, 28190480 + ... + 28191257.

It is an arithmetic number, because the mean of its divisors is an integer number (5497219455).

Almost surely, 2^21932495693 is an apocalyptic number.

It is an amenable number.

21932495693 is a deficient number, since it is larger than the sum of its proper divisors (56382127).

21932495693 is an equidigital number, since it uses as much as digits as its factorization.

21932495693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56382126.

The product of its digits is 3149280, while the sum is 53.

The spelling of 21932495693 in words is "twenty-one billion, nine hundred thirty-two million, four hundred ninety-five thousand, six hundred ninety-three".