121400305172 has 24 divisors (see below), whose sum is σ = 213920179200. Its totient is φ = 60281318240.

The previous prime is 121400305171. The next prime is 121400305177. The reversal of 121400305172 is 271503004121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121400305171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324998 + ... + 590274.

It is an arithmetic number, because the mean of its divisors is an integer number (8913340800).

Almost surely, 2^121400305172 is an apocalyptic number.

It is an amenable number.

121400305172 is a deficient number, since it is larger than the sum of its proper divisors (92519874028).

121400305172 is a wasteful number, since it uses less digits than its factorization.

121400305172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266071 (or 266069 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 121400305172 its reverse (271503004121), we get a palindrome (392903309293).

The spelling of 121400305172 in words is "one hundred twenty-one billion, four hundred million, three hundred five thousand, one hundred seventy-two".