1242021340 has 48 divisors (see below), whose sum is σ = 2985196032. Its totient is φ = 425215296.

The previous prime is 1242021299. The next prime is 1242021371. The reversal of 1242021340 is 431202421.

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 15 ways as a sum of consecutive naturals, for example, 95679 + ... + 107881.

It is an arithmetic number, because the mean of its divisors is an integer number (62191584).

Almost surely, 2^1242021340 is an apocalyptic number.

1242021340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242021340 is an abundant number, since it is smaller than the sum of its proper divisors (1743174692).

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

1242021340 is a wasteful number, since it uses less digits than its factorization.

1242021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12946 (or 12944 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1242021340 is about 35242.3231356845. The cubic root of 1242021340 is about 1074.9205176497.

Adding to 1242021340 its reverse (431202421), we get a palindrome (1673223761).

The spelling of 1242021340 in words is "one billion, two hundred forty-two million, twenty-one thousand, three hundred forty".