21155143154291 has 2 divisors, whose sum is σ = 21155143154292. Its totient is φ = 21155143154290.

The previous prime is 21155143154279. The next prime is 21155143154339. The reversal of 21155143154291 is 19245134155112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21155143154291 is a prime.

It is a super-2 number, since 2×21155143154291² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21155143154221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577571577145 + 10577571577146.

It is an arithmetic number, because the mean of its divisors is an integer number (10577571577146).

Almost surely, 2^{21155143154291} is an apocalyptic number.

21155143154291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155143154291 is an equidigital number, since it uses as much as digits as its factorization.

21155143154291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 44.

The spelling of 21155143154291 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-three million, one hundred fifty-four thousand, two hundred ninety-one".