121289216 has 20 divisors (see below), whose sum is σ = 242342562. Its totient is φ = 60644352.

The previous prime is 121289209. The next prime is 121289221. The reversal of 121289216 is 612982121.

It can be written as a sum of positive squares in only one way, i.e., 101929216 + 19360000 = 10096^2 + 4400^2 .

It is a super-2 number, since 2×121289216² = 29422147835789312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117935 + ... + 118958.

Almost surely, 2^121289216 is an apocalyptic number.

121289216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121289216 is a deficient number, since it is larger than the sum of its proper divisors (121053346).

121289216 is an frugal number, since it uses more digits than its factorization.

121289216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236911 (or 236895 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 121289216 is about 11013.1383356426. The cubic root of 121289216 is about 495.0025044937.

The spelling of 121289216 in words is "one hundred twenty-one million, two hundred eighty-nine thousand, two hundred sixteen".