121686324028 has 24 divisors (see below), whose sum is σ = 217670951232. Its totient is φ = 59496873984.

The previous prime is 121686324013. The next prime is 121686324077. The reversal of 121686324028 is 820423686121.

It is a happy number.

It is a super-2 number, since 2×121686324028² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63925 + ... + 497452.

It is an arithmetic number, because the mean of its divisors is an integer number (9069622968).

Almost surely, 2^121686324028 is an apocalyptic number.

It is an amenable number.

121686324028 is a deficient number, since it is larger than the sum of its proper divisors (95984627204).

121686324028 is a wasteful number, since it uses less digits than its factorization.

121686324028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562581 (or 562579 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 121686324028 in words is "one hundred twenty-one billion, six hundred eighty-six million, three hundred twenty-four thousand, twenty-eight".