221636646374141 has 2 divisors, whose sum is σ = 221636646374142. Its totient is φ = 221636646374140.

The previous prime is 221636646374069. The next prime is 221636646374167. The reversal of 221636646374141 is 141473646636122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185576020871641 + 36060625502500 = 13622629^2 + 6005050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221636646374141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221636646374041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110818323187070 + 110818323187071.

It is an arithmetic number, because the mean of its divisors is an integer number (110818323187071).

Almost surely, 2^{221636646374141} is an apocalyptic number.

It is an amenable number.

221636646374141 is a deficient number, since it is larger than the sum of its proper divisors (1).

221636646374141 is an equidigital number, since it uses as much as digits as its factorization.

221636646374141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 56.

The spelling of 221636646374141 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, six hundred forty-six million, three hundred seventy-four thousand, one hundred forty-one".