121656216 has 64 divisors (see below), whose sum is σ = 351319680. Its totient is φ = 34695680.

The previous prime is 121656209. The next prime is 121656229. The reversal of 121656216 is 612656121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9066 + ... + 18041.

It is an arithmetic number, because the mean of its divisors is an integer number (5489370).

Almost surely, 2^121656216 is an apocalyptic number.

It is an amenable number.

121656216 is an abundant number, since it is smaller than the sum of its proper divisors (229663464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121656216 is a wasteful number, since it uses less digits than its factorization.

121656216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27144 (or 27140 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 121656216 is about 11029.7876679472. The cubic root of 121656216 is about 495.5012655068.

It can be divided in two parts, 12165 and 6216, that added together give a palindrome (18381).

The spelling of 121656216 in words is "one hundred twenty-one million, six hundred fifty-six thousand, two hundred sixteen".