21193931263 has 4 divisors (see below), whose sum is σ = 22440633120. Its totient is φ = 19947229408.

The previous prime is 21193931257. The next prime is 21193931287. The reversal of 21193931263 is 36213939112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21193931263 - 2¹⁷ = 21193800191 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 (21193934263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623350903 + ... + 623350936.

It is an arithmetic number, because the mean of its divisors is an integer number (5610158280).

Almost surely, 2^21193931263 is an apocalyptic number.

21193931263 is a deficient number, since it is larger than the sum of its proper divisors (1246701857).

21193931263 is a wasteful number, since it uses less digits than its factorization.

21193931263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246701856.

The product of its digits is 52488, while the sum is 40.

The spelling of 21193931263 in words is "twenty-one billion, one hundred ninety-three million, nine hundred thirty-one thousand, two hundred sixty-three".