2156126041205 has 8 divisors (see below), whose sum is σ = 2587481145432. Its totient is φ = 1724814235648.

The previous prime is 2156126041133. The next prime is 2156126041213. The reversal of 2156126041205 is 5021406216512.

It can be written as a sum of positive squares in 4 ways, for example, as 17959752196 + 2138166289009 = 134014^2 + 1462247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2156126041205 - 2⁸ = 2156126040949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10715012 + ... + 10914381.

It is an arithmetic number, because the mean of its divisors is an integer number (323435143179).

Almost surely, 2^{2156126041205} is an apocalyptic number.

It is an amenable number.

2156126041205 is a deficient number, since it is larger than the sum of its proper divisors (431355104227).

2156126041205 is a wasteful number, since it uses less digits than its factorization.

2156126041205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21649335.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 2156126041205 in words is "two trillion, one hundred fifty-six billion, one hundred twenty-six million, forty-one thousand, two hundred five".