1242112421 has 8 divisors (see below), whose sum is σ = 1355289888. Its totient is φ = 1128978000.

The previous prime is 1242112409. The next prime is 1242112477.

1242112421 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242112421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242112393 and 1242112402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242112481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93791 + ... + 106211.

It is an arithmetic number, because the mean of its divisors is an integer number (169411236).

Almost surely, 2^1242112421 is an apocalyptic number.

1242112421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242112421 is a deficient number, since it is larger than the sum of its proper divisors (113177467).

1242112421 is a wasteful number, since it uses less digits than its factorization.

1242112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21523.

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

The square root of 1242112421 is about 35243.6153224949. The cubic root of 1242112421 is about 1074.9467926793.

It can be divided in two parts, 12421 and 12421, that added together give a palindrome (24842).

The spelling of 1242112421 in words is "one billion, two hundred forty-two million, one hundred twelve thousand, four hundred twenty-one".