2157811110270 has 192 divisors, whose sum is σ = 6115406696640. Its totient is φ = 541315547136.

The previous prime is 2157811110229. The next prime is 2157811110283. The reversal of 2157811110270 is 720111187512.

2157811110270 is a `hidden beast` number, since 2 + 1 + 578 + 1 + 1 + 1 + 10 + 2 + 70 = 666.

It is a super-3 number, since 3×2157811110270³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 211690294 + ... + 211700486.

It is an arithmetic number, because the mean of its divisors is an integer number (31851076545).

Almost surely, 2^{2157811110270} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157811110270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3057703348320).

2157811110270 is an abundant number, since it is smaller than the sum of its proper divisors (3957595586370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157811110270 is a wasteful number, since it uses less digits than its factorization.

2157811110270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12956 (or 12933 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 36.

Adding to 2157811110270 its reverse (720111187512), we get a palindrome (2877922297782).

The spelling of 2157811110270 in words is "two trillion, one hundred fifty-seven billion, eight hundred eleven million, one hundred ten thousand, two hundred seventy".