21155143154339 has 2 divisors, whose sum is σ = 21155143154340. Its totient is φ = 21155143154338.

The previous prime is 21155143154291. The next prime is 21155143154359. The reversal of 21155143154339 is 93345134155112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21155143154339 - 2¹⁶ = 21155143088803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155143154293 and 21155143154302.

It is not a weakly prime, because it can be changed into another prime (21155143154359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577571577169 + 10577571577170.

It is an arithmetic number, because the mean of its divisors is an integer number (10577571577170).

Almost surely, 2^{21155143154339} is an apocalyptic number.

21155143154339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155143154339 is an equidigital number, since it uses as much as digits as its factorization.

21155143154339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 47.

The spelling of 21155143154339 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-three million, one hundred fifty-four thousand, three hundred thirty-nine".