1021120240 has 40 divisors (see below), whose sum is σ = 2713263840. Its totient is φ = 350098176.

The previous prime is 1021120223. The next prime is 1021120279. The reversal of 1021120240 is 420211201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1021120240.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 911155 + ... + 912274.

It is an arithmetic number, because the mean of its divisors is an integer number (67831596).

Almost surely, 2^1021120240 is an apocalyptic number.

1021120240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021120240 is an abundant number, since it is smaller than the sum of its proper divisors (1692143600).

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

1021120240 is a wasteful number, since it uses less digits than its factorization.

1021120240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823449 (or 1823443 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1021120240 is about 31954.9720700864. The cubic root of 1021120240 is about 1006.9910907528.

Adding to 1021120240 its reverse (420211201), we get a palindrome (1441331441).

The spelling of 1021120240 in words is "one billion, twenty-one million, one hundred twenty thousand, two hundred forty".