21143891147 has 2 divisors, whose sum is σ = 21143891148. Its totient is φ = 21143891146.

The previous prime is 21143891141. The next prime is 21143891189. The reversal of 21143891147 is 74119834112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21143891147 - 2²⁰ = 21142842571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21143891141) 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, 10571945573 + 10571945574.

It is an arithmetic number, because the mean of its divisors is an integer number (10571945574).

Almost surely, 2^21143891147 is an apocalyptic number.

21143891147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143891147 is an equidigital number, since it uses as much as digits as its factorization.

21143891147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The spelling of 21143891147 in words is "twenty-one billion, one hundred forty-three million, eight hundred ninety-one thousand, one hundred forty-seven".