2156111023500 has 576 divisors, whose sum is σ = 8071272308736. Its totient is φ = 474133824000.

The previous prime is 2156111023481. The next prime is 2156111023513. The reversal of 2156111023500 is 53201116512.

2156111023500 is a `hidden beast` number, since 2 + 1 + 5 + 611 + 10 + 2 + 35 + 0 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 168928119 + ... + 168940881.

It is an arithmetic number, because the mean of its divisors is an integer number (14012625536).

Almost surely, 2^{2156111023500} is an apocalyptic number.

2156111023500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156111023500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4035636154368).

2156111023500 is an abundant number, since it is smaller than the sum of its proper divisors (5915161285236).

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

2156111023500 is a wasteful number, since it uses less digits than its factorization.

2156111023500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12999 (or 12984 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 2156111023500 in words is "two trillion, one hundred fifty-six billion, one hundred eleven million, twenty-three thousand, five hundred".