212121221989 has 8 divisors (see below), whose sum is σ = 214113650400. Its totient is φ = 210128978736.

The previous prime is 212121221987. The next prime is 212121221999. The reversal of 212121221989 is 989122121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121221989 - 2¹ = 212121221987 is a prime.

It is a super-2 number, since 2×212121221989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121221987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584362 + ... + 3643060.

It is an arithmetic number, because the mean of its divisors is an integer number (26764206300).

Almost surely, 2^212121221989 is an apocalyptic number.

It is an amenable number.

212121221989 is a deficient number, since it is larger than the sum of its proper divisors (1992428411).

212121221989 is a wasteful number, since it uses less digits than its factorization.

212121221989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92579.

The product of its digits is 20736, while the sum is 40.

The spelling of 212121221989 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred eighty-nine".