212212222220 has 12 divisors (see below), whose sum is σ = 445645666704. Its totient is φ = 84884888880.

The previous prime is 212212222217. The next prime is 212212222223. The reversal of 212212222220 is 22222212212.

It is an interprime number because it is at equal distance from previous prime (212212222217) and next prime (212212222223).

It is a super-4 number, since 4×212212222220⁴ (a number of 46 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10610611111 = 212212222220 / (2 + 1 + 2 + 2 + 1 + 2 + 2 + 2 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 212212222192 and 212212222201.

It is not an unprimeable number, because it can be changed into a prime (212212222223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5305305536 + ... + 5305305575.

It is an arithmetic number, because the mean of its divisors is an integer number (37137138892).

Almost surely, 2^212212222220 is an apocalyptic number.

212212222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212212222220 is an abundant number, since it is smaller than the sum of its proper divisors (233433444484).

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

212212222220 is a wasteful number, since it uses less digits than its factorization.

212212222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610611120 (or 10610611118 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 212212222220 its reverse (22222212212), we get a palindrome (234434434432).

The spelling of 212212222220 in words is "two hundred twelve billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty".