2121830455249 has 2 divisors, whose sum is σ = 2121830455250. Its totient is φ = 2121830455248.

The previous prime is 2121830455211. The next prime is 2121830455307. The reversal of 2121830455249 is 9425540381212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1209929601024 + 911900854225 = 1099968^2 + 954935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121830455249 - 2¹³ = 2121830447057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121830455199 and 2121830455208.

It is not a weakly prime, because it can be changed into another prime (2121830455649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060915227624 + 1060915227625.

It is an arithmetic number, because the mean of its divisors is an integer number (1060915227625).

Almost surely, 2^{2121830455249} is an apocalyptic number.

It is an amenable number.

2121830455249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121830455249 is an equidigital number, since it uses as much as digits as its factorization.

2121830455249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 2121830455249 in words is "two trillion, one hundred twenty-one billion, eight hundred thirty million, four hundred fifty-five thousand, two hundred forty-nine".