121341440 has 160 divisors (see below), whose sum is σ = 329978880. Its totient is φ = 42393600.

The previous prime is 121341419. The next prime is 121341457. The reversal of 121341440 is 44143121.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×121341440² = 29447490122547200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872891 + ... + 873029.

It is an arithmetic number, because the mean of its divisors is an integer number (2062368).

Almost surely, 2^121341440 is an apocalyptic number.

121341440 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 121341440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164989440).

121341440 is an abundant number, since it is smaller than the sum of its proper divisors (208637440).

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

121341440 is a wasteful number, since it uses less digits than its factorization.

121341440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 121341440 is about 11015.5090667658. The cubic root of 121341440 is about 495.0735393921.

Adding to 121341440 its reverse (44143121), we get a palindrome (165484561).

The spelling of 121341440 in words is "one hundred twenty-one million, three hundred forty-one thousand, four hundred forty".