1242142120 has 16 divisors (see below), whose sum is σ = 2794819860. Its totient is φ = 496856832.

The previous prime is 1242142103. The next prime is 1242142127. The reversal of 1242142120 is 212412421.

It can be written as a sum of positive squares in 2 ways, for example, as 1227381156 + 14760964 = 35034^2 + 3842^2 .

It is not an unprimeable number, because it can be changed into a prime (1242142127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15526737 + ... + 15526816.

Almost surely, 2^1242142120 is an apocalyptic number.

1242142120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242142120 is an abundant number, since it is smaller than the sum of its proper divisors (1552677740).

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

1242142120 is a wasteful number, since it uses less digits than its factorization.

1242142120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31053564 (or 31053560 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1242142120 is about 35244.0366587030. The cubic root of 1242142120 is about 1074.9553599635.

Adding to 1242142120 its reverse (212412421), we get a palindrome (1454554541).

The spelling of 1242142120 in words is "one billion, two hundred forty-two million, one hundred forty-two thousand, one hundred twenty".