1113355721 has 8 divisors (see below), whose sum is σ = 1180845864. Its totient is φ = 1046087680.

The previous prime is 1113355703. The next prime is 1113355723. The reversal of 1113355721 is 1275533111.

It can be written as a sum of positive squares in 4 ways, for example, as 187005625 + 926350096 = 13675^2 + 30436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1113355721 is a prime.

It is a super-2 number, since 2×1113355721² = 2479121922966859682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1113355723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45140 + ... + 65301.

It is an arithmetic number, because the mean of its divisors is an integer number (147605733).

Almost surely, 2^1113355721 is an apocalyptic number.

It is an amenable number.

1113355721 is a deficient number, since it is larger than the sum of its proper divisors (67490143).

1113355721 is a wasteful number, since it uses less digits than its factorization.

1113355721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111051.

The product of its digits is 3150, while the sum is 29.

The square root of 1113355721 is about 33366.9854946473. The cubic root of 1113355721 is about 1036.4411520060.

Adding to 1113355721 its reverse (1275533111), we get a palindrome (2388888832).

The spelling of 1113355721 in words is "one billion, one hundred thirteen million, three hundred fifty-five thousand, seven hundred twenty-one".