21943767047 has 2 divisors, whose sum is σ = 21943767048. Its totient is φ = 21943767046.

The previous prime is 21943767031. The next prime is 21943767049. The reversal of 21943767047 is 74076734912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21943767047 - 2⁴ = 21943767031 is a prime.

Together with 21943767049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21943766986 and 21943767004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21943767049) 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 as a sum of consecutive naturals, namely, 10971883523 + 10971883524.

It is an arithmetic number, because the mean of its divisors is an integer number (10971883524).

Almost surely, 2^21943767047 is an apocalyptic number.

21943767047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21943767047 is an equidigital number, since it uses as much as digits as its factorization.

21943767047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 21943767047 in words is "twenty-one billion, nine hundred forty-three million, seven hundred sixty-seven thousand, forty-seven".