121509390649780 has 96 divisors (see below), whose sum is σ = 299392980606720. Its totient is φ = 40562299914240.

The previous prime is 121509390649771. The next prime is 121509390649799. The reversal of 121509390649780 is 87946093905121.

It is a super-2 number, since 2×121509390649780² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 61531525 + ... + 63475564.

It is an arithmetic number, because the mean of its divisors is an integer number (3118676881320).

It is a 4-persistent number, because k⋅121509390649780 is pandigital for 1 ≤ k ≤ 4, but not for k = 5.

Almost surely, 2^{121509390649780} is an apocalyptic number.

121509390649780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121509390649780 is an abundant number, since it is smaller than the sum of its proper divisors (177883589956940).

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

121509390649780 is a wasteful number, since it uses less digits than its factorization.

121509390649780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125007289 (or 125007287 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 64.

The spelling of 121509390649780 in words is "one hundred twenty-one trillion, five hundred nine billion, three hundred ninety million, six hundred forty-nine thousand, seven hundred eighty".