2157015123 has 16 divisors (see below), whose sum is σ = 3298662400. Its totient is φ = 1391622120.

The previous prime is 2157015121. The next prime is 2157015137. The reversal of 2157015123 is 3215107512.

2157015123 is a `hidden beast` number, since 21 + 570 + 1 + 51 + 23 = 666.

It is not a de Polignac number, because 2157015123 - 2¹ = 2157015121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157015121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287703 + ... + 1289376.

It is an arithmetic number, because the mean of its divisors is an integer number (206166400).

Almost surely, 2^2157015123 is an apocalyptic number.

2157015123 is a deficient number, since it is larger than the sum of its proper divisors (1141647277).

2157015123 is a wasteful number, since it uses less digits than its factorization.

2157015123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577119 (or 2577113 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 2157015123 is about 46443.6768893248. The cubic root of 2157015123 is about 1292.0651022591.

The spelling of 2157015123 in words is "two billion, one hundred fifty-seven million, fifteen thousand, one hundred twenty-three".