121345255980 has 240 divisors, whose sum is σ = 431524003680. Its totient is φ = 28297423872.

The previous prime is 121345255937. The next prime is 121345256003. The reversal of 121345255980 is 89552543121.

121345255980 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 4 + 52 + 5 + 598 + 0 = 666.

It is a super-2 number, since 2×121345255980² (a number of 23 digits) contains 22 as substring.

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

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 79 ways as a sum of consecutive naturals, for example, 248512 + ... + 551768.

It is an arithmetic number, because the mean of its divisors is an integer number (1798016682).

Almost surely, 2^121345255980 is an apocalyptic number.

121345255980 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 121345255980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215762001840).

121345255980 is an abundant number, since it is smaller than the sum of its proper divisors (310178747700).

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

121345255980 is a wasteful number, since it uses less digits than its factorization.

121345255980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303310 (or 303299 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 121345255980 in words is "one hundred twenty-one billion, three hundred forty-five million, two hundred fifty-five thousand, nine hundred eighty".