21117950183711 has 4 divisors (see below), whose sum is σ = 21464146088424. Its totient is φ = 20771754279000.

The previous prime is 21117950183689. The next prime is 21117950183731. The reversal of 21117950183711 is 11738105971112.

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 21117950183711 - 2⁶ = 21117950183647 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 (21117950183731) 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, 173097952265 + ... + 173097952386.

It is an arithmetic number, because the mean of its divisors is an integer number (5366036522106).

Almost surely, 2^{21117950183711} is an apocalyptic number.

21117950183711 is a deficient number, since it is larger than the sum of its proper divisors (346195904713).

21117950183711 is an equidigital number, since it uses as much as digits as its factorization.

21117950183711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346195904712.

The product of its (nonzero) digits is 105840, while the sum is 47.

The spelling of 21117950183711 in words is "twenty-one trillion, one hundred seventeen billion, nine hundred fifty million, one hundred eighty-three thousand, seven hundred eleven".