121554033440 has 144 divisors (see below), whose sum is σ = 338763104064. Its totient is φ = 41088499200.

The previous prime is 121554033427. The next prime is 121554033451. The reversal of 121554033440 is 44330455121.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 121554033397 and 121554033406.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 447455 + ... + 665825.

It is an arithmetic number, because the mean of its divisors is an integer number (2352521556).

Almost surely, 2^121554033440 is an apocalyptic number.

121554033440 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 121554033440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169381552032).

121554033440 is an abundant number, since it is smaller than the sum of its proper divisors (217209070624).

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

121554033440 is a wasteful number, since it uses less digits than its factorization.

121554033440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218471 (or 218456 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 121554033440 its reverse (44330455121), we get a palindrome (165884488561).

The spelling of 121554033440 in words is "one hundred twenty-one billion, five hundred fifty-four million, thirty-three thousand, four hundred forty".