121213033240 has 128 divisors (see below), whose sum is σ = 307835458560. Its totient is φ = 42620143104.

The previous prime is 121213033147. The next prime is 121213033241. The reversal of 121213033240 is 42330312121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213033241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2692597 + ... + 2737243.

It is an arithmetic number, because the mean of its divisors is an integer number (2404964520).

Almost surely, 2^121213033240 is an apocalyptic number.

121213033240 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 121213033240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153917729280).

121213033240 is an abundant number, since it is smaller than the sum of its proper divisors (186622425320).

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

121213033240 is a wasteful number, since it uses less digits than its factorization.

121213033240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44921 (or 44917 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 121213033240 its reverse (42330312121), we get a palindrome (163543345361).

The spelling of 121213033240 in words is "one hundred twenty-one billion, two hundred thirteen million, thirty-three thousand, two hundred forty".