121002656 has 24 divisors (see below), whose sum is σ = 239126580. Its totient is φ = 60272128.

The previous prime is 121002643. The next prime is 121002671. The reversal of 121002656 is 656200121.

It can be written as a sum of positive squares in 2 ways, for example, as 86192656 + 34810000 = 9284^2 + 5900^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580 + ... + 15636.

Almost surely, 2^121002656 is an apocalyptic number.

121002656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121002656 is a deficient number, since it is larger than the sum of its proper divisors (118123924).

121002656 is a wasteful number, since it uses less digits than its factorization.

121002656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14336 (or 14328 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121002656 is about 11000.1207266102. The cubic root of 121002656 is about 494.6123632538.

Adding to 121002656 its reverse (656200121), we get a palindrome (777202777).

The spelling of 121002656 in words is "one hundred twenty-one million, two thousand, six hundred fifty-six".