121389568 has 20 divisors (see below), whose sum is σ = 242543070. Its totient is φ = 60694528.

The previous prime is 121389547. The next prime is 121389589. The reversal of 121389568 is 865983121.

It is an interprime number because it is at equal distance from previous prime (121389547) and next prime (121389589).

It can be written as a sum of positive squares in only one way, i.e., 120824064 + 565504 = 10992^2 + 752^2 .

It is a super-3 number, since 3×121389568³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 118033 + ... + 119056.

Almost surely, 2^121389568 is an apocalyptic number.

It is an amenable number.

121389568 is a deficient number, since it is larger than the sum of its proper divisors (121153502).

121389568 is an frugal number, since it uses more digits than its factorization.

121389568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237107 (or 237091 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 121389568 is about 11017.6934065166. The cubic root of 121389568 is about 495.1389848816.

The spelling of 121389568 in words is "one hundred twenty-one million, three hundred eighty-nine thousand, five hundred sixty-eight".