1841878794221 has 2 divisors, whose sum is σ = 1841878794222. Its totient is φ = 1841878794220.

The previous prime is 1841878794199. The next prime is 1841878794263. The reversal of 1841878794221 is 1224978781481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1840401544996 + 1477249225 = 1356614^2 + 38435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1841878794221 - 2¹⁸ = 1841878532077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1841878794121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920939397110 + 920939397111.

It is an arithmetic number, because the mean of its divisors is an integer number (920939397111).

Almost surely, 2^{1841878794221} is an apocalyptic number.

It is an amenable number.

1841878794221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1841878794221 is an equidigital number, since it uses as much as digits as its factorization.

1841878794221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14450688, while the sum is 62.

The spelling of 1841878794221 in words is "one trillion, eight hundred forty-one billion, eight hundred seventy-eight million, seven hundred ninety-four thousand, two hundred twenty-one".