1111442721 has 32 divisors (see below), whose sum is σ = 1552232448. Its totient is φ = 706605120.

The previous prime is 1111442713. The next prime is 1111442743. The reversal of 1111442721 is 1272441111.

It is a happy number.

It is not a de Polignac number, because 1111442721 - 2³ = 1111442713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1111442691 and 1111442700.

It is not an unprimeable number, because it can be changed into a prime (1111442771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2379730 + ... + 2380196.

It is an arithmetic number, because the mean of its divisors is an integer number (48507264).

Almost surely, 2^1111442721 is an apocalyptic number.

It is an amenable number.

1111442721 is a deficient number, since it is larger than the sum of its proper divisors (440789727).

1111442721 is a wasteful number, since it uses less digits than its factorization.

1111442721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its digits is 448, while the sum is 24.

The square root of 1111442721 is about 33338.3071105898. The cubic root of 1111442721 is about 1035.8471973050.

Adding to 1111442721 its reverse (1272441111), we get a palindrome (2383883832).

It can be divided in two parts, 11114 and 42721, that added together give a palindrome (53835).

The spelling of 1111442721 in words is "one billion, one hundred eleven million, four hundred forty-two thousand, seven hundred twenty-one".