211878788980122 has 96 divisors (see below), whose sum is σ = 502225342968960. Its totient is φ = 64023541292160.

The previous prime is 211878788980099. The next prime is 211878788980127. The reversal of 211878788980122 is 221089887878112.

211878788980122 is a `hidden beast` number, since 211 + 8 + 78 + 78 + 89 + 80 + 122 = 666.

It is a super-2 number, since 2×211878788980122² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211878788980127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1614704188 + ... + 1614835400.

It is an arithmetic number, because the mean of its divisors is an integer number (5231513989260).

Almost surely, 2^{211878788980122} is an apocalyptic number.

211878788980122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 211878788980122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251112671484480).

211878788980122 is an abundant number, since it is smaller than the sum of its proper divisors (290346553988838).

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

211878788980122 is a wasteful number, since it uses less digits than its factorization.

211878788980122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154308 (or 154305 counting only the distinct ones).

The product of its (nonzero) digits is 115605504, while the sum is 72.

The spelling of 211878788980122 in words is "two hundred eleven trillion, eight hundred seventy-eight billion, seven hundred eighty-eight million, nine hundred eighty thousand, one hundred twenty-two".