2157123236031 has 6 divisors (see below), whose sum is σ = 3115844674280. Its totient is φ = 1438082157348.

The previous prime is 2157123236011. The next prime is 2157123236053. The reversal of 2157123236031 is 1306323217512.

2157123236031 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 1 + 23 + 23 + 603 + 1 = 666.

It is not a de Polignac number, because 2157123236031 - 2⁵ = 2157123235999 is a prime.

It is a super-2 number, since 2×2157123236031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157123236011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119840179771 + ... + 119840179788.

Almost surely, 2^{2157123236031} is an apocalyptic number.

2157123236031 is a deficient number, since it is larger than the sum of its proper divisors (958721438249).

2157123236031 is a wasteful number, since it uses less digits than its factorization.

2157123236031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239680359565 (or 239680359562 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 2157123236031 in words is "two trillion, one hundred fifty-seven billion, one hundred twenty-three million, two hundred thirty-six thousand, thirty-one".