2141856869 has 2 divisors, whose sum is σ = 2141856870. Its totient is φ = 2141856868.

The previous prime is 2141856811. The next prime is 2141856883. The reversal of 2141856869 is 9686581412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1160287969 + 981568900 = 34063^2 + 31330^2 .

It is a cyclic number.

It is not a de Polignac number, because 2141856869 - 2²⁴ = 2125079653 is a prime.

It is a super-2 number, since 2×2141856869² = 9175101694564966322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2141855869) 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, 1070928434 + 1070928435.

It is an arithmetic number, because the mean of its divisors is an integer number (1070928435).

Almost surely, 2^2141856869 is an apocalyptic number.

It is an amenable number.

2141856869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2141856869 is an equidigital number, since it uses as much as digits as its factorization.

2141856869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 2141856869 is about 46280.1995350063. The cubic root of 2141856869 is about 1289.0313560482.

It can be divided in two parts, 21418 and 56869, that added together give a palindrome (78287).

The spelling of 2141856869 in words is "two billion, one hundred forty-one million, eight hundred fifty-six thousand, eight hundred sixty-nine".