212001021992 has 16 divisors (see below), whose sum is σ = 397531691700. Its totient is φ = 105992570880.

The previous prime is 212001021983. The next prime is 212001022003. The reversal of 212001021992 is 299120100212.

It can be written as a sum of positive squares in 2 ways, for example, as 194070205156 + 17930816836 = 440534^2 + 133906^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878267 + ... + 1093322.

Almost surely, 2^212001021992 is an apocalyptic number.

It is an amenable number.

212001021992 is a deficient number, since it is larger than the sum of its proper divisors (185530669708).

212001021992 is a wasteful number, since it uses less digits than its factorization.

212001021992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985036 (or 1985032 counting only the distinct ones).

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

The spelling of 212001021992 in words is "two hundred twelve billion, one million, twenty-one thousand, nine hundred ninety-two".