121210989 has 16 divisors (see below), whose sum is σ = 169072512. Its totient is φ = 77096448.

The previous prime is 121210951. The next prime is 121211017. The reversal of 121210989 is 989012121.

It is not a de Polignac number, because 121210989 - 2¹² = 121206893 is a prime.

It is a super-3 number, since 3×121210989³ (a number of 25 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27849 + ... + 31905.

It is an arithmetic number, because the mean of its divisors is an integer number (10567032).

Almost surely, 2^121210989 is an apocalyptic number.

It is an amenable number.

121210989 is a deficient number, since it is larger than the sum of its proper divisors (47861523).

121210989 is a wasteful number, since it uses less digits than its factorization.

121210989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 121210989 is about 11009.5862320071. The cubic root of 121210989 is about 494.8960622502.

The spelling of 121210989 in words is "one hundred twenty-one million, two hundred ten thousand, nine hundred eighty-nine".