21183797171 has 2 divisors, whose sum is σ = 21183797172. Its totient is φ = 21183797170.

The previous prime is 21183797147. The next prime is 21183797179. The reversal of 21183797171 is 17179738112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21183797171 - 2²² = 21179602867 is a prime.

It is not a weakly prime, because it can be changed into another prime (21183797179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591898585 + 10591898586.

It is an arithmetic number, because the mean of its divisors is an integer number (10591898586).

Almost surely, 2^21183797171 is an apocalyptic number.

21183797171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183797171 is an equidigital number, since it uses as much as digits as its factorization.

21183797171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 47.

The spelling of 21183797171 in words is "twenty-one billion, one hundred eighty-three million, seven hundred ninety-seven thousand, one hundred seventy-one".