121651210564 has 24 divisors (see below), whose sum is σ = 239233821120. Its totient is φ = 53705550624.

The previous prime is 121651210493. The next prime is 121651210579. The reversal of 121651210564 is 465012156121.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 50856334 + ... + 50858725.

It is an arithmetic number, because the mean of its divisors is an integer number (9968075880).

Almost surely, 2^121651210564 is an apocalyptic number.

It is an amenable number.

121651210564 is a deficient number, since it is larger than the sum of its proper divisors (117582610556).

121651210564 is a wasteful number, since it uses less digits than its factorization.

121651210564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101715099 (or 101715097 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

Adding to 121651210564 its reverse (465012156121), we get a palindrome (586663366685).

The spelling of 121651210564 in words is "one hundred twenty-one billion, six hundred fifty-one million, two hundred ten thousand, five hundred sixty-four".