1242244421 has 16 divisors (see below), whose sum is σ = 1419431040. Its totient is φ = 1076137920.

The previous prime is 1242244411. The next prime is 1242244429. The reversal of 1242244421 is 1244422421.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1242244421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242244429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58931 + ... + 77183.

It is an arithmetic number, because the mean of its divisors is an integer number (88714440).

Almost surely, 2^1242244421 is an apocalyptic number.

1242244421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242244421 is a deficient number, since it is larger than the sum of its proper divisors (177186619).

1242244421 is a wasteful number, since it uses less digits than its factorization.

1242244421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18556.

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

The square root of 1242244421 is about 35245.4879523607. The cubic root of 1242244421 is about 1074.9848697348.

Adding to 1242244421 its reverse (1244422421), we get a palindrome (2486666842).

The spelling of 1242244421 in words is "one billion, two hundred forty-two million, two hundred forty-four thousand, four hundred twenty-one".