121135877280 has 288 divisors, whose sum is σ = 477483709248. Its totient is φ = 27638784000.

The previous prime is 121135877249. The next prime is 121135877281. The reversal of 121135877280 is 82778531121.

121135877280 is a `hidden beast` number, since 1 + 2 + 11 + 358 + 7 + 7 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (121135877281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44355 + ... + 494205.

It is an arithmetic number, because the mean of its divisors is an integer number (1657929546).

Almost surely, 2^121135877280 is an apocalyptic number.

121135877280 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 121135877280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238741854624).

121135877280 is an abundant number, since it is smaller than the sum of its proper divisors (356347831968).

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

121135877280 is a wasteful number, since it uses less digits than its factorization.

121135877280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449900 (or 449889 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 121135877280 in words is "one hundred twenty-one billion, one hundred thirty-five million, eight hundred seventy-seven thousand, two hundred eighty".