111315721 has 8 divisors (see below), whose sum is σ = 124717824. Its totient is φ = 98460720.

The previous prime is 111315719. The next prime is 111315727. The reversal of 111315721 is 127513111.

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

It is a cyclic number.

It is not a de Polignac number, because 111315721 - 2¹ = 111315719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111315692 and 111315701.

It is not an unprimeable number, because it can be changed into a prime (111315727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136345 + ... + 137158.

It is an arithmetic number, because the mean of its divisors is an integer number (15589728).

Almost surely, 2^111315721 is an apocalyptic number.

111315721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111315721 is a deficient number, since it is larger than the sum of its proper divisors (13402103).

111315721 is a wasteful number, since it uses less digits than its factorization.

111315721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273551.

The product of its digits is 210, while the sum is 22.

The square root of 111315721 is about 10550.6265690716. The cubic root of 111315721 is about 481.0447743383.

Adding to 111315721 its reverse (127513111), we get a palindrome (238828832).

It can be divided in two parts, 111315 and 721, that multiplied together give a triangular number (80258115 = T₁₂₆₆₉).

The spelling of 111315721 in words is "one hundred eleven million, three hundred fifteen thousand, seven hundred twenty-one".