1242120220 has 48 divisors (see below), whose sum is σ = 2873810016. Its totient is φ = 447200000.

The previous prime is 1242120167. The next prime is 1242120233. The reversal of 1242120220 is 220212421.

It is a junction number, because it is equal to n+sod(n) for n = 1242120194 and 1242120203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 50170.

It is an arithmetic number, because the mean of its divisors is an integer number (59871042).

Almost surely, 2^1242120220 is an apocalyptic number.

1242120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242120220 is an abundant number, since it is smaller than the sum of its proper divisors (1631689796).

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

1242120220 is a wasteful number, since it uses less digits than its factorization.

1242120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56022 (or 56020 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1242120220 is about 35243.7259664752. The cubic root of 1242120220 is about 1074.9490424737.

Adding to 1242120220 its reverse (220212421), we get a palindrome (1462332641).

The spelling of 1242120220 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, two hundred twenty".