2158203206281 has 2 divisors, whose sum is σ = 2158203206282. Its totient is φ = 2158203206280.

The previous prime is 2158203206249. The next prime is 2158203206309. The reversal of 2158203206281 is 1826023028512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1808379457600 + 349823748681 = 1344760^2 + 591459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158203206281 - 2⁵ = 2158203206249 is a prime.

It is a super-2 number, since 2×2158203206281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2158203206581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079101603140 + 1079101603141.

It is an arithmetic number, because the mean of its divisors is an integer number (1079101603141).

Almost surely, 2^{2158203206281} is an apocalyptic number.

It is an amenable number.

2158203206281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158203206281 is an equidigital number, since it uses as much as digits as its factorization.

2158203206281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 2158203206281 in words is "two trillion, one hundred fifty-eight billion, two hundred three million, two hundred six thousand, two hundred eighty-one".