121043656 has 8 divisors (see below), whose sum is σ = 226956870. Its totient is φ = 60521824.

The previous prime is 121043647. The next prime is 121043669. The reversal of 121043656 is 656340121.

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 33246756 = 9370^2 + 5766^2 .

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7565221 + ... + 7565236.

Almost surely, 2^121043656 is an apocalyptic number.

It is an amenable number.

121043656 is a deficient number, since it is larger than the sum of its proper divisors (105913214).

121043656 is a wasteful number, since it uses less digits than its factorization.

121043656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15130463 (or 15130459 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 121043656 is about 11001.9841846823. The cubic root of 121043656 is about 494.6682210274.

Adding to 121043656 its reverse (656340121), we get a palindrome (777383777).

The spelling of 121043656 in words is "one hundred twenty-one million, forty-three thousand, six hundred fifty-six".