2181409937293 has 2 divisors, whose sum is σ = 2181409937294. Its totient is φ = 2181409937292.

The previous prime is 2181409937263. The next prime is 2181409937303. The reversal of 2181409937293 is 3927399041812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2060221010409 + 121188926884 = 1435347^2 + 348122^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181409937293 - 2³³ = 2172820002701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181409937263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090704968646 + 1090704968647.

It is an arithmetic number, because the mean of its divisors is an integer number (1090704968647).

Almost surely, 2^{2181409937293} is an apocalyptic number.

It is an amenable number.

2181409937293 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181409937293 is an equidigital number, since it uses as much as digits as its factorization.

2181409937293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 2181409937293 in words is "two trillion, one hundred eighty-one billion, four hundred nine million, nine hundred thirty-seven thousand, two hundred ninety-three".