1242412121 has 8 divisors (see below), whose sum is σ = 1252279560. Its totient is φ = 1232569728.

The previous prime is 1242412043. The next prime is 1242412151. The reversal of 1242412121 is 1212142421.

It can be written as a sum of positive squares in 4 ways, for example, as 864654025 + 377758096 = 29405^2 + 19436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242412121 - 2¹⁰ = 1242411097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242412093 and 1242412102.

It is not an unprimeable number, because it can be changed into a prime (1242412151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100445 + ... + 112133.

It is an arithmetic number, because the mean of its divisors is an integer number (156534945).

Almost surely, 2^1242412121 is an apocalyptic number.

It is an amenable number.

1242412121 is a deficient number, since it is larger than the sum of its proper divisors (9867439).

1242412121 is a wasteful number, since it uses less digits than its factorization.

1242412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12523.

The product of its digits is 256, while the sum is 20.

The square root of 1242412121 is about 35247.8668999984. The cubic root of 1242412121 is about 1075.0332410129.

Adding to 1242412121 its reverse (1212142421), we get a palindrome (2454554542).

The spelling of 1242412121 in words is "one billion, two hundred forty-two million, four hundred twelve thousand, one hundred twenty-one".