1112021721 has 24 divisors (see below), whose sum is σ = 1732043040. Its totient is φ = 685195200.

The previous prime is 1112021719. The next prime is 1112021747. The reversal of 1112021721 is 1271202111.

It is not a de Polignac number, because 1112021721 - 2¹ = 1112021719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112021694 and 1112021703.

It is not an unprimeable number, because it can be changed into a prime (1112021761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72295 + ... + 86316.

It is an arithmetic number, because the mean of its divisors is an integer number (72168460).

Almost surely, 2^1112021721 is an apocalyptic number.

It is an amenable number.

1112021721 is a deficient number, since it is larger than the sum of its proper divisors (620021319).

1112021721 is a wasteful number, since it uses less digits than its factorization.

1112021721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158677 (or 158674 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 1112021721 is about 33346.9896842279. The cubic root of 1112021721 is about 1036.0270390547.

Adding to 1112021721 its reverse (1271202111), we get a palindrome (2383223832).

The spelling of 1112021721 in words is "one billion, one hundred twelve million, twenty-one thousand, seven hundred twenty-one".