121672121506 has 32 divisors (see below), whose sum is σ = 208214496000. Its totient is φ = 52826224896.

The previous prime is 121672121477. The next prime is 121672121507. The reversal of 121672121506 is 605121276121.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (121672121507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814705 + ... + 952411.

It is an arithmetic number, because the mean of its divisors is an integer number (6506703000).

Almost surely, 2^121672121506 is an apocalyptic number.

121672121506 is a deficient number, since it is larger than the sum of its proper divisors (86542374494).

121672121506 is a wasteful number, since it uses less digits than its factorization.

121672121506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139738.

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 121672121506 its reverse (605121276121), we get a palindrome (726793397627).

The spelling of 121672121506 in words is "one hundred twenty-one billion, six hundred seventy-two million, one hundred twenty-one thousand, five hundred six".