1442421521 has 4 divisors (see below), whose sum is σ = 1442503152. Its totient is φ = 1442339892.

The previous prime is 1442421509. The next prime is 1442421523. The reversal of 1442421521 is 1251242441.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1251242441 = 59 ⋅21207499.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1442421521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1442421523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015 + ... + 53748.

It is an arithmetic number, because the mean of its divisors is an integer number (360625788).

Almost surely, 2^1442421521 is an apocalyptic number.

It is an amenable number.

1442421521 is a deficient number, since it is larger than the sum of its proper divisors (81631).

1442421521 is an equidigital number, since it uses as much as digits as its factorization.

1442421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81630.

The product of its digits is 2560, while the sum is 26.

The square root of 1442421521 is about 37979.2248604418. The cubic root of 1442421521 is about 1129.8758630961.

Adding to 1442421521 its reverse (1251242441), we get a palindrome (2693663962).

The spelling of 1442421521 in words is "one billion, four hundred forty-two million, four hundred twenty-one thousand, five hundred twenty-one".