2156042157 has 16 divisors (see below), whose sum is σ = 3123640320. Its totient is φ = 1317783600.

The previous prime is 2156042131. The next prime is 2156042159. The reversal of 2156042157 is 7512406512.

It is not a de Polignac number, because 2156042157 - 2⁶ = 2156042093 is a prime.

It is a super-2 number, since 2×2156042157² = 9297035565522425298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156042159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 608319 + ... + 611852.

It is an arithmetic number, because the mean of its divisors is an integer number (195227520).

Almost surely, 2^2156042157 is an apocalyptic number.

It is an amenable number.

2156042157 is a deficient number, since it is larger than the sum of its proper divisors (967598163).

2156042157 is a wasteful number, since it uses less digits than its factorization.

2156042157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220224.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2156042157 is about 46433.2010203906. The cubic root of 2156042157 is about 1291.8708022026.

Adding to 2156042157 its reverse (7512406512), we get a palindrome (9668448669).

The spelling of 2156042157 in words is "two billion, one hundred fifty-six million, forty-two thousand, one hundred fifty-seven".