111522142421 has 4 divisors (see below), whose sum is σ = 111821129772. Its totient is φ = 111223155072.

The previous prime is 111522142399. The next prime is 111522142429. The reversal of 111522142421 is 124241225111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65490439921 + 46031702500 = 255911^2 + 214550^2 .

It is a cyclic number.

It is not a de Polignac number, because 111522142421 - 2¹⁰ = 111522141397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111522142429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149493116 + ... + 149493861.

It is an arithmetic number, because the mean of its divisors is an integer number (27955282443).

Almost surely, 2^111522142421 is an apocalyptic number.

It is an amenable number.

111522142421 is a deficient number, since it is larger than the sum of its proper divisors (298987351).

111522142421 is an equidigital number, since it uses as much as digits as its factorization.

111522142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298987350.

The product of its digits is 1280, while the sum is 26.

Adding to 111522142421 its reverse (124241225111), we get a palindrome (235763367532).

The spelling of 111522142421 in words is "one hundred eleven billion, five hundred twenty-two million, one hundred forty-two thousand, four hundred twenty-one".