1242121120 has 48 divisors (see below), whose sum is σ = 2941452360. Its totient is φ = 495673344.

The previous prime is 1242121063. The next prime is 1242121147. The reversal of 1242121120 is 211212421.

It can be written as a sum of positive squares in 4 ways, for example, as 775733904 + 466387216 = 27852^2 + 21596^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1242121094 and 1242121103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60316 + ... + 78244.

Almost surely, 2^1242121120 is an apocalyptic number.

1242121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242121120 is an abundant number, since it is smaller than the sum of its proper divisors (1699331240).

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

1242121120 is a wasteful number, since it uses less digits than its factorization.

1242121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18377 (or 18369 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1242121120 is about 35243.7387347029. The cubic root of 1242121120 is about 1074.9493020980.

Adding to 1242121120 its reverse (211212421), we get a palindrome (1453333541).

The spelling of 1242121120 in words is "one billion, two hundred forty-two million, one hundred twenty-one thousand, one hundred twenty".