111201721 has 4 divisors (see below), whose sum is σ = 111296592. Its totient is φ = 111106852.

The previous prime is 111201683. The next prime is 111201751. The reversal of 111201721 is 127102111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111201721 - 2⁷ = 111201593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111201695 and 111201704.

It is not an unprimeable number, because it can be changed into a prime (111201751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45655 + ... + 48028.

It is an arithmetic number, because the mean of its divisors is an integer number (27824148).

Almost surely, 2^111201721 is an apocalyptic number.

It is an amenable number.

111201721 is a deficient number, since it is larger than the sum of its proper divisors (94871).

111201721 is an equidigital number, since it uses as much as digits as its factorization.

111201721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94870.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 111201721 is about 10545.2226624192. Note that the first 3 decimals coincide. The cubic root of 111201721 is about 480.8805033353.

Adding to 111201721 its reverse (127102111), we get a palindrome (238303832).

The spelling of 111201721 in words is "one hundred eleven million, two hundred one thousand, seven hundred twenty-one".