212121992 has 16 divisors (see below), whose sum is σ = 404470800. Its totient is φ = 104263120.

The previous prime is 212121989. The next prime is 212122007. The reversal of 212121992 is 299121212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224234 + ... + 225177.

It is an arithmetic number, because the mean of its divisors is an integer number (25279425).

Almost surely, 2^212121992 is an apocalyptic number.

It is an amenable number.

212121992 is a deficient number, since it is larger than the sum of its proper divisors (192348808).

212121992 is a wasteful number, since it uses less digits than its factorization.

212121992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449476 (or 449472 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 212121992 is about 14564.4083985585. The cubic root of 212121992 is about 596.3875457928.

The spelling of 212121992 in words is "two hundred twelve million, one hundred twenty-one thousand, nine hundred ninety-two".