2181399137101 has 2 divisors, whose sum is σ = 2181399137102. Its totient is φ = 2181399137100.

The previous prime is 2181399137023. The next prime is 2181399137107. The reversal of 2181399137101 is 1017319931812.

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., 2124933021225 + 56466115876 = 1457715^2 + 237626^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181399137101 - 2¹¹ = 2181399135053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181399137107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090699568550 + 1090699568551.

It is an arithmetic number, because the mean of its divisors is an integer number (1090699568551).

Almost surely, 2^{2181399137101} is an apocalyptic number.

It is an amenable number.

2181399137101 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181399137101 is an equidigital number, since it uses as much as digits as its factorization.

2181399137101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 2181399137101 in words is "two trillion, one hundred eighty-one billion, three hundred ninety-nine million, one hundred thirty-seven thousand, one hundred one".