121323656 has 8 divisors (see below), whose sum is σ = 227481870. Its totient is φ = 60661824.

The previous prime is 121323641. The next prime is 121323659. The reversal of 121323656 is 656323121.

It can be written as a sum of positive squares in only one way, i.e., 113848900 + 7474756 = 10670^2 + 2734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (121323659) by changing a digit.

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 as a sum of consecutive naturals, namely, 7582721 + ... + 7582736.

Almost surely, 2^121323656 is an apocalyptic number.

It is an amenable number.

121323656 is a deficient number, since it is larger than the sum of its proper divisors (106158214).

121323656 is a wasteful number, since it uses less digits than its factorization.

121323656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15165463 (or 15165459 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 121323656 is about 11014.7018116697. The cubic root of 121323656 is about 495.0493519477.

Adding to 121323656 its reverse (656323121), we get a palindrome (777646777).

The spelling of 121323656 in words is "one hundred twenty-one million, three hundred twenty-three thousand, six hundred fifty-six".