112721921 has 8 divisors (see below), whose sum is σ = 125309184. Its totient is φ = 100694160.

The previous prime is 112721893. The next prime is 112721929. The reversal of 112721921 is 129127211.

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-112721921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (112721929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139451 + ... + 140256.

It is an arithmetic number, because the mean of its divisors is an integer number (15663648).

It is a Proth number, since it is equal to 215 ⋅ 2¹⁹ + 1 and 215 < 2¹⁹.

Almost surely, 2^112721921 is an apocalyptic number.

It is an amenable number.

112721921 is a deficient number, since it is larger than the sum of its proper divisors (12587263).

112721921 is a wasteful number, since it uses less digits than its factorization.

112721921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279751.

The product of its digits is 504, while the sum is 26.

The square root of 112721921 is about 10617.0580199978. The cubic root of 112721921 is about 483.0619095429.

The spelling of 112721921 in words is "one hundred twelve million, seven hundred twenty-one thousand, nine hundred twenty-one".