212120989 has 4 divisors (see below), whose sum is σ = 215716320. Its totient is φ = 208525660.

The previous prime is 212120983. The next prime is 212121023. The reversal of 212120989 is 989021212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212120989 - 2⁵ = 212120957 is a prime.

It is a super-3 number, since 3×212120989³ (a number of 26 digits) contains 333 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 (212120983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1797577 + ... + 1797694.

It is an arithmetic number, because the mean of its divisors is an integer number (53929080).

Almost surely, 2^212120989 is an apocalyptic number.

It is an amenable number.

212120989 is a deficient number, since it is larger than the sum of its proper divisors (3595331).

212120989 is an equidigital number, since it uses as much as digits as its factorization.

212120989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595330.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 212120989 is about 14564.3739652619. The cubic root of 212120989 is about 596.3866058028.

The spelling of 212120989 in words is "two hundred twelve million, one hundred twenty thousand, nine hundred eighty-nine".