212111122122 has 64 divisors (see below), whose sum is σ = 489829248000. Its totient is φ = 67963648320.

The previous prime is 212111122109. The next prime is 212111122163. The reversal of 212111122122 is 221221111212.

It is a super-2 number, since 2×212111122122² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 212111122095 and 212111122104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175773 + ... + 674624.

It is an arithmetic number, because the mean of its divisors is an integer number (7653582000).

Almost surely, 2^212111122122 is an apocalyptic number.

212111122122 is an abundant number, since it is smaller than the sum of its proper divisors (277718125878).

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

212111122122 is a wasteful number, since it uses less digits than its factorization.

212111122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850588 (or 850582 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 212111122122 its reverse (221221111212), we get a palindrome (433332233334).

The spelling of 212111122122 in words is "two hundred twelve billion, one hundred eleven million, one hundred twenty-two thousand, one hundred twenty-two".