121651363642 has 16 divisors (see below), whose sum is σ = 186385272192. Its totient is φ = 59523297120.

The previous prime is 121651363637. The next prime is 121651363643. The reversal of 121651363642 is 246363156121.

It is a junction number, because it is equal to n+sod(n) for n = 121651363595 and 121651363604.

It is not an unprimeable number, because it can be changed into a prime (121651363643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625153 + ... + 796315.

It is an arithmetic number, because the mean of its divisors is an integer number (11649079512).

Almost surely, 2^121651363642 is an apocalyptic number.

121651363642 is a deficient number, since it is larger than the sum of its proper divisors (64733908550).

121651363642 is a wasteful number, since it uses less digits than its factorization.

121651363642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178773.

The product of its digits is 155520, while the sum is 40.

The spelling of 121651363642 in words is "one hundred twenty-one billion, six hundred fifty-one million, three hundred sixty-three thousand, six hundred forty-two".