21691175263 has 8 divisors (see below), whose sum is σ = 21963942000. Its totient is φ = 21418680768.

The previous prime is 21691175213. The next prime is 21691175293. The reversal of 21691175263 is 36257119612.

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 21691175263 - 2⁹ = 21691174751 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 (21691175213) 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, 94723 + ... + 228811.

It is an arithmetic number, because the mean of its divisors is an integer number (2745492750).

Almost surely, 2^21691175263 is an apocalyptic number.

21691175263 is a deficient number, since it is larger than the sum of its proper divisors (272766737).

21691175263 is a wasteful number, since it uses less digits than its factorization.

21691175263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136121.

The product of its digits is 136080, while the sum is 43.

The spelling of 21691175263 in words is "twenty-one billion, six hundred ninety-one million, one hundred seventy-five thousand, two hundred sixty-three".