121401140240 has 20 divisors (see below), whose sum is σ = 282257651244. Its totient is φ = 48560456064.

The previous prime is 121401140227. The next prime is 121401140249. The reversal of 121401140240 is 42041104121.

It can be written as a sum of positive squares in 2 ways, for example, as 91407056896 + 29994083344 = 302336^2 + 173188^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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

It is not an unprimeable number, because it can be changed into a prime (121401140249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 758757047 + ... + 758757206.

Almost surely, 2^121401140240 is an apocalyptic number.

121401140240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121401140240 is an abundant number, since it is smaller than the sum of its proper divisors (160856511004).

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

121401140240 is a wasteful number, since it uses less digits than its factorization.

121401140240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517514266 (or 1517514260 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121401140240 its reverse (42041104121), we get a palindrome (163442244361).

The spelling of 121401140240 in words is "one hundred twenty-one billion, four hundred one million, one hundred forty thousand, two hundred forty".