21470118191 has 2 divisors, whose sum is σ = 21470118192. Its totient is φ = 21470118190.

The previous prime is 21470118181. The next prime is 21470118203. The reversal of 21470118191 is 19181107412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470118191 is a prime.

It is a super-2 number, since 2×21470118191² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21470118121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735059095 + 10735059096.

It is an arithmetic number, because the mean of its divisors is an integer number (10735059096).

Almost surely, 2^21470118191 is an apocalyptic number.

21470118191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470118191 is an equidigital number, since it uses as much as digits as its factorization.

21470118191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 21470118191 in words is "twenty-one billion, four hundred seventy million, one hundred eighteen thousand, one hundred ninety-one".