2181774905041 has 2 divisors, whose sum is σ = 2181774905042. Its totient is φ = 2181774905040.

The previous prime is 2181774905029. The next prime is 2181774905113. The reversal of 2181774905041 is 1405094771812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926821610000 + 254953295041 = 1388100^2 + 504929^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181774905041 - 2¹³ = 2181774896849 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181774915041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090887452520 + 1090887452521.

It is an arithmetic number, because the mean of its divisors is an integer number (1090887452521).

Almost surely, 2^{2181774905041} is an apocalyptic number.

It is an amenable number.

2181774905041 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181774905041 is an equidigital number, since it uses as much as digits as its factorization.

2181774905041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 2181774905041 in words is "two trillion, one hundred eighty-one billion, seven hundred seventy-four million, nine hundred five thousand, forty-one".