1185494822921 has 2 divisors, whose sum is σ = 1185494822922. Its totient is φ = 1185494822920.

The previous prime is 1185494822917. The next prime is 1185494823001. The reversal of 1185494822921 is 1292284945811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1094929939321 + 90564883600 = 1046389^2 + 300940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1185494822921 - 2² = 1185494822917 is a prime.

It is not a weakly prime, because it can be changed into another prime (1185494822621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592747411460 + 592747411461.

It is an arithmetic number, because the mean of its divisors is an integer number (592747411461).

Almost surely, 2^{1185494822921} is an apocalyptic number.

It is an amenable number.

1185494822921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1185494822921 is an equidigital number, since it uses as much as digits as its factorization.

1185494822921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 56.

The spelling of 1185494822921 in words is "one trillion, one hundred eighty-five billion, four hundred ninety-four million, eight hundred twenty-two thousand, nine hundred twenty-one".