212121021212 has 6 divisors (see below), whose sum is σ = 371211787128. Its totient is φ = 106060510604.

The previous prime is 212121021209. The next prime is 212121021223. The reversal of 212121021212 is 212120121212.

It is a super-3 number, since 3×212121021212³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26515127648 + ... + 26515127655.

It is an arithmetic number, because the mean of its divisors is an integer number (61868631188).

Almost surely, 2^212121021212 is an apocalyptic number.

It is an amenable number.

212121021212 is a deficient number, since it is larger than the sum of its proper divisors (159090765916).

212121021212 is a wasteful number, since it uses less digits than its factorization.

212121021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53030255307 (or 53030255305 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212121021212 its reverse (212120121212), we get a palindrome (424241142424).

The spelling of 212121021212 in words is "two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, two hundred twelve".