121989152 has 24 divisors (see below), whose sum is σ = 240428412. Its totient is φ = 60928000.

The previous prime is 121989149. The next prime is 121989163. The reversal of 121989152 is 251989121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 118287376 + 3701776 = 10876^2 + 1924^2 .

It is a congruent number.

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, 42152 + ... + 44952.

Almost surely, 2^121989152 is an apocalyptic number.

It is an amenable number.

121989152 is a deficient number, since it is larger than the sum of its proper divisors (118439260).

121989152 is a wasteful number, since it uses less digits than its factorization.

121989152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172 (or 4164 counting only the distinct ones).

The product of its digits is 12960, while the sum is 38.

The square root of 121989152 is about 11044.8699403841. The cubic root of 121989152 is about 495.9528657951.

The spelling of 121989152 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred fifty-two".