212440054856647 has 2 divisors, whose sum is σ = 212440054856648. Its totient is φ = 212440054856646.

The previous prime is 212440054856629. The next prime is 212440054856657. The reversal of 212440054856647 is 746658450044212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212440054856647 is a prime.

It is a super-2 number, since 2×212440054856647² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212440054856591 and 212440054856600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212440054856657) 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, 106220027428323 + 106220027428324.

It is an arithmetic number, because the mean of its divisors is an integer number (106220027428324).

Almost surely, 2^{212440054856647} is an apocalyptic number.

212440054856647 is a deficient number, since it is larger than the sum of its proper divisors (1).

212440054856647 is an equidigital number, since it uses as much as digits as its factorization.

212440054856647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51609600, while the sum is 58.

The spelling of 212440054856647 in words is "two hundred twelve trillion, four hundred forty billion, fifty-four million, eight hundred fifty-six thousand, six hundred forty-seven".