121643672 has 8 divisors (see below), whose sum is σ = 228081900. Its totient is φ = 60821832.

The previous prime is 121643671. The next prime is 121643677. The reversal of 121643672 is 276346121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121643671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7602722 + ... + 7602737.

Almost surely, 2^121643672 is an apocalyptic number.

It is an amenable number.

121643672 is a deficient number, since it is larger than the sum of its proper divisors (106438228).

121643672 is a wasteful number, since it uses less digits than its factorization.

121643672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15205465 (or 15205461 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 121643672 is about 11029.2190113353. The cubic root of 121643672 is about 495.4842345055.

Adding to 121643672 its reverse (276346121), we get a palindrome (397989793).

The spelling of 121643672 in words is "one hundred twenty-one million, six hundred forty-three thousand, six hundred seventy-two".