7121144240 has 80 divisors (see below), whose sum is σ = 19242696960. Its totient is φ = 2400142080.

The previous prime is 7121144221. The next prime is 7121144257. The reversal of 7121144240 is 424411217.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74726 + ... + 140805.

It is an arithmetic number, because the mean of its divisors is an integer number (240533712).

Almost surely, 2^7121144240 is an apocalyptic number.

7121144240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7121144240 is an abundant number, since it is smaller than the sum of its proper divisors (12121552720).

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

7121144240 is a wasteful number, since it uses less digits than its factorization.

7121144240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215610 (or 215604 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 7121144240 is about 84386.8724387864. The cubic root of 7121144240 is about 1923.9033943106.

Adding to 7121144240 its reverse (424411217), we get a palindrome (7545555457).

The spelling of 7121144240 in words is "seven billion, one hundred twenty-one million, one hundred forty-four thousand, two hundred forty".