1242142421 has 8 divisors (see below), whose sum is σ = 1347457944. Its totient is φ = 1138222080.

The previous prime is 1242142409. The next prime is 1242142427. The reversal of 1242142421 is 1242412421.

It can be written as a sum of positive squares in 4 ways, for example, as 24900100 + 1217242321 = 4990^2 + 34889^2 .

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 1242142421 - 2³⁰ = 168400597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242142427) 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, 346940 + ... + 350501.

It is an arithmetic number, because the mean of its divisors is an integer number (168432243).

Almost surely, 2^1242142421 is an apocalyptic number.

It is an amenable number.

1242142421 is a deficient number, since it is larger than the sum of its proper divisors (105315523).

1242142421 is a wasteful number, since it uses less digits than its factorization.

1242142421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697591.

The product of its digits is 1024, while the sum is 23.

The square root of 1242142421 is about 35244.0409289287. The cubic root of 1242142421 is about 1074.9554467924.

Adding to 1242142421 its reverse (1242412421), we get a palindrome (2484554842).

The spelling of 1242142421 in words is "one billion, two hundred forty-two million, one hundred forty-two thousand, four hundred twenty-one".