1242442421 has 4 divisors (see below), whose sum is σ = 1355391744. Its totient is φ = 1129493100.

The previous prime is 1242442391. The next prime is 1242442423.

It is a happy number.

1242442421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242442421 - 2¹⁰ = 1242441397 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 (1242442423) 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, 56474645 + ... + 56474666.

It is an arithmetic number, because the mean of its divisors is an integer number (338847936).

Almost surely, 2^1242442421 is an apocalyptic number.

1242442421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242442421 is a deficient number, since it is larger than the sum of its proper divisors (112949323).

1242442421 is a wasteful number, since it uses less digits than its factorization.

1242442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112949322.

The product of its digits is 4096, while the sum is 26.

The square root of 1242442421 is about 35248.2967106214. The cubic root of 1242442421 is about 1075.0419802607.

It can be divided in two parts, 12424 and 42421, that added together give a palindrome (54845).

The spelling of 1242442421 in words is "one billion, two hundred forty-two million, four hundred forty-two thousand, four hundred twenty-one".