121954045500 has 336 divisors, whose sum is σ = 456396717504. Its totient is φ = 27874627200.

The previous prime is 121954045483. The next prime is 121954045501. The reversal of 121954045500 is 5540459121.

121954045500 is a `hidden beast` number, since 1 + 21 + 9 + 540 + 45 + 50 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121954045501) by changing a digit.

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 111 ways as a sum of consecutive naturals, for example, 2527602 + ... + 2575398.

It is an arithmetic number, because the mean of its divisors is an integer number (1358323564).

Almost surely, 2^121954045500 is an apocalyptic number.

121954045500 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 121954045500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228198358752).

121954045500 is an abundant number, since it is smaller than the sum of its proper divisors (334442672004).

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

121954045500 is an equidigital number, since it uses as much as digits as its factorization.

121954045500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47841 (or 47814 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 121954045500 in words is "one hundred twenty-one billion, nine hundred fifty-four million, forty-five thousand, five hundred".