212021212122 has 32 divisors (see below), whose sum is σ = 475823194560. Its totient is φ = 69973995600.

The previous prime is 212021212121. The next prime is 212021212127. The reversal of 212021212122 is 221212120212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 212021212095 and 212021212104.

It is not an unprimeable number, because it can be changed into a prime (212021212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19431768 + ... + 19442675.

It is an arithmetic number, because the mean of its divisors is an integer number (14869474830).

Almost surely, 2^212021212122 is an apocalyptic number.

212021212122 is an abundant number, since it is smaller than the sum of its proper divisors (263801982438).

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

212021212122 is a wasteful number, since it uses less digits than its factorization.

212021212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38874555 (or 38874549 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212021212122 its reverse (221212120212), we get a palindrome (433233332334).

The spelling of 212021212122 in words is "two hundred twelve billion, twenty-one million, two hundred twelve thousand, one hundred twenty-two".