21255153345043 has 2 divisors, whose sum is σ = 21255153345044. Its totient is φ = 21255153345042.

The previous prime is 21255153345007. The next prime is 21255153345073. The reversal of 21255153345043 is 34054335155212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21255153345043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21255153345073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627576672521 + 10627576672522.

It is an arithmetic number, because the mean of its divisors is an integer number (10627576672522).

Almost surely, 2^{21255153345043} is an apocalyptic number.

21255153345043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255153345043 is an equidigital number, since it uses as much as digits as its factorization.

21255153345043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 21255153345043 in words is "twenty-one trillion, two hundred fifty-five billion, one hundred fifty-three million, three hundred forty-five thousand, forty-three".