21847741211 has 2 divisors, whose sum is σ = 21847741212. Its totient is φ = 21847741210.

The previous prime is 21847741189. The next prime is 21847741219. The reversal of 21847741211 is 11214774812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21847741211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21847741219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923870605 + 10923870606.

It is an arithmetic number, because the mean of its divisors is an integer number (10923870606).

Almost surely, 2^21847741211 is an apocalyptic number.

21847741211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21847741211 is an equidigital number, since it uses as much as digits as its factorization.

21847741211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The spelling of 21847741211 in words is "twenty-one billion, eight hundred forty-seven million, seven hundred forty-one thousand, two hundred eleven".