121121545600 has 192 divisors, whose sum is σ = 345611026800. Its totient is φ = 41453158400.

The previous prime is 121121545579. The next prime is 121121545631. The reversal of 121121545600 is 6545121121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497196 + ... + 699604.

Almost surely, 2^121121545600 is an apocalyptic number.

121121545600 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 121121545600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172805513400).

121121545600 is an abundant number, since it is smaller than the sum of its proper divisors (224489481200).

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

121121545600 is a wasteful number, since it uses less digits than its factorization.

121121545600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202461 (or 202444 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 121121545600 its reverse (6545121121), we get a palindrome (127666666721).

The spelling of 121121545600 in words is "one hundred twenty-one billion, one hundred twenty-one million, five hundred forty-five thousand, six hundred".