121561644200 has 96 divisors (see below), whose sum is σ = 283907052000. Its totient is φ = 48405638400.

The previous prime is 121561644161. The next prime is 121561644223. The reversal of 121561644200 is 2446165121.

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 23 ways as a sum of consecutive naturals, for example, 51269015 + ... + 51271385.

It is an arithmetic number, because the mean of its divisors is an integer number (2957365125).

Almost surely, 2^121561644200 is an apocalyptic number.

121561644200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121561644200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141953526000).

121561644200 is an abundant number, since it is smaller than the sum of its proper divisors (162345407800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121561644200 is a wasteful number, since it uses less digits than its factorization.

121561644200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435 (or 3426 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 121561644200 in words is "one hundred twenty-one billion, five hundred sixty-one million, six hundred forty-four thousand, two hundred".