2112100121178 has 56 divisors (see below), whose sum is σ = 4766957355636. Its totient is φ = 701527780800.

The previous prime is 2112100121119. The next prime is 2112100121179. The reversal of 2112100121178 is 8711210012112.

It can be written as a sum of positive squares in 2 ways, for example, as 1924565220369 + 187534900809 = 1387287^2 + 433053^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2112100121179) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2167933 + ... + 2987328.

Almost surely, 2^{2112100121178} is an apocalyptic number.

2112100121178 is an abundant number, since it is smaller than the sum of its proper divisors (2654857234458).

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

2112100121178 is an equidigital number, since it uses as much as digits as its factorization.

2112100121178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155562 (or 5155547 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The spelling of 2112100121178 in words is "two trillion, one hundred twelve billion, one hundred million, one hundred twenty-one thousand, one hundred seventy-eight".