2183487921821 has 2 divisors, whose sum is σ = 2183487921822. Its totient is φ = 2183487921820.

The previous prime is 2183487921773. The next prime is 2183487921851. The reversal of 2183487921821 is 1281297843812.

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., 1927668444025 + 255819477796 = 1388405^2 + 505786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2183487921821 - 2³⁰ = 2182414179997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2183487921851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091743960910 + 1091743960911.

It is an arithmetic number, because the mean of its divisors is an integer number (1091743960911).

Almost surely, 2^{2183487921821} is an apocalyptic number.

It is an amenable number.

2183487921821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2183487921821 is an equidigital number, since it uses as much as digits as its factorization.

2183487921821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3096576, while the sum is 56.

The spelling of 2183487921821 in words is "two trillion, one hundred eighty-three billion, four hundred eighty-seven million, nine hundred twenty-one thousand, eight hundred twenty-one".