111402721 has 4 divisors (see below), whose sum is σ = 111460612. Its totient is φ = 111344832.

The previous prime is 111402713. The next prime is 111402727. The reversal of 111402721 is 127204111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127204111 = 359 ⋅354329.

It can be written as a sum of positive squares in 2 ways, for example, as 72165025 + 39237696 = 8495^2 + 6264^2 .

It is a cyclic number.

It is not a de Polignac number, because 111402721 - 2³ = 111402713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111402727) 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, 25956 + ... + 29941.

It is an arithmetic number, because the mean of its divisors is an integer number (27865153).

Almost surely, 2^111402721 is an apocalyptic number.

It is an amenable number.

111402721 is a deficient number, since it is larger than the sum of its proper divisors (57891).

111402721 is an equidigital number, since it uses as much as digits as its factorization.

111402721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57890.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 111402721 is about 10554.7487416802. The cubic root of 111402721 is about 481.1700636108.

Adding to 111402721 its reverse (127204111), we get a palindrome (238606832).

It can be divided in two parts, 11140 and 2721, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 111402721 in words is "one hundred eleven million, four hundred two thousand, seven hundred twenty-one".