1242421043 has 4 divisors (see below), whose sum is σ = 1256380920. Its totient is φ = 1228461168.

The previous prime is 1242421027. The next prime is 1242421067. The reversal of 1242421043 is 3401242421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3401242421 = 19 ⋅179012759.

It is a cyclic number.

It is not a de Polignac number, because 1242421043 - 2⁴ = 1242421027 is a prime.

It is a super-2 number, since 2×1242421043² = 3087220096178415698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242421003) 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, 6979805 + ... + 6979982.

It is an arithmetic number, because the mean of its divisors is an integer number (314095230).

Almost surely, 2^1242421043 is an apocalyptic number.

1242421043 is a deficient number, since it is larger than the sum of its proper divisors (13959877).

1242421043 is an equidigital number, since it uses as much as digits as its factorization.

1242421043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13959876.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1242421043 is about 35247.9934606213. The cubic root of 1242421043 is about 1075.0358143467.

Adding to 1242421043 its reverse (3401242421), we get a palindrome (4643663464).

The spelling of 1242421043 in words is "one billion, two hundred forty-two million, four hundred twenty-one thousand, forty-three".