121778234144 has 48 divisors (see below), whose sum is σ = 276425872128. Its totient is φ = 51728796672.

The previous prime is 121778234141. The next prime is 121778234209. The reversal of 121778234144 is 441432877121.

It is a happy number.

It is a super-2 number, since 2×121778234144² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121778234095 and 121778234104.

It is not an unprimeable number, because it can be changed into a prime (121778234141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380232 + ... + 2430855.

It is an arithmetic number, because the mean of its divisors is an integer number (5758872336).

Almost surely, 2^121778234144 is an apocalyptic number.

121778234144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121778234144 is an abundant number, since it is smaller than the sum of its proper divisors (154647637984).

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

121778234144 is a wasteful number, since it uses less digits than its factorization.

121778234144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811217 (or 4811209 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The spelling of 121778234144 in words is "one hundred twenty-one billion, seven hundred seventy-eight million, two hundred thirty-four thousand, one hundred forty-four".