2181774905113 has 2 divisors, whose sum is σ = 2181774905114. Its totient is φ = 2181774905112.

The previous prime is 2181774905041. The next prime is 2181774905137. The reversal of 2181774905113 is 3115094771812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2181685564809 + 89340304 = 1477053^2 + 9452^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181774905113 - 2²¹ = 2181772807961 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181774908113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090887452556 + 1090887452557.

It is an arithmetic number, because the mean of its divisors is an integer number (1090887452557).

Almost surely, 2^{2181774905113} is an apocalyptic number.

It is an amenable number.

2181774905113 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181774905113 is an equidigital number, since it uses as much as digits as its factorization.

2181774905113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 2181774905113 in words is "two trillion, one hundred eighty-one billion, seven hundred seventy-four million, nine hundred five thousand, one hundred thirteen".