2106856837 has 2 divisors, whose sum is σ = 2106856838. Its totient is φ = 2106856836.

The previous prime is 2106856771. The next prime is 2106856841. The reversal of 2106856837 is 7386586012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1964794276 + 142062561 = 44326^2 + 11919^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106856837 - 2¹⁹ = 2106332549 is a prime.

It is a super-2 number, since 2×2106856837² = 8877691463227289138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106856847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053428418 + 1053428419.

It is an arithmetic number, because the mean of its divisors is an integer number (1053428419).

Almost surely, 2^2106856837 is an apocalyptic number.

It is an amenable number.

2106856837 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106856837 is an equidigital number, since it uses as much as digits as its factorization.

2106856837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 2106856837 is about 45900.5102041361. The cubic root of 2106856837 is about 1281.9714162693.

The spelling of 2106856837 in words is "two billion, one hundred six million, eight hundred fifty-six thousand, eight hundred thirty-seven".