212121222412 has 96 divisors (see below), whose sum is σ = 434351554560. Its totient is φ = 89673756480.

The previous prime is 212121222377. The next prime is 212121222461. The reversal of 212121222412 is 214222121212.

212121222412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212121222412² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9693139 + ... + 9714997.

It is an arithmetic number, because the mean of its divisors is an integer number (4524495360).

Almost surely, 2^212121222412 is an apocalyptic number.

212121222412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

212121222412 is an abundant number, since it is smaller than the sum of its proper divisors (222230332148).

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

212121222412 is a wasteful number, since it uses less digits than its factorization.

212121222412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22163 (or 22161 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Adding to 212121222412 its reverse (214222121212), we get a palindrome (426343343624).

The spelling of 212121222412 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, four hundred twelve".