211121200121178 has 32 divisors (see below), whose sum is σ = 428000759012736. Its totient is φ = 69419323957248.

The previous prime is 211121200121177. The next prime is 211121200121213. The reversal of 211121200121178 is 871121002121112.

It is a super-2 number, since 2×211121200121178² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211121200121177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664471651 + ... + 664789302.

It is an arithmetic number, because the mean of its divisors is an integer number (13375023719148).

Almost surely, 2^{211121200121178} is an apocalyptic number.

211121200121178 is an abundant number, since it is smaller than the sum of its proper divisors (216879558891558).

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

211121200121178 is a wasteful number, since it uses less digits than its factorization.

211121200121178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329261318.

The product of its (nonzero) digits is 896, while the sum is 30.

The spelling of 211121200121178 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, one hundred seventy-eight".