1442021111 has 2 divisors, whose sum is σ = 1442021112. Its totient is φ = 1442021110.

The previous prime is 1442021099. The next prime is 1442021117. The reversal of 1442021111 is 1111202441.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1442021111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1442021111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1442021117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721010555 + 721010556.

It is an arithmetic number, because the mean of its divisors is an integer number (721010556).

Almost surely, 2^1442021111 is an apocalyptic number.

1442021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442021111 is an equidigital number, since it uses as much as digits as its factorization.

1442021111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1442021111 is about 37973.9530599594. The cubic root of 1442021111 is about 1129.7713038631.

Adding to 1442021111 its reverse (1111202441), we get a palindrome (2553223552).

The spelling of 1442021111 in words is "one billion, four hundred forty-two million, twenty-one thousand, one hundred eleven".