111223213525 has 24 divisors (see below), whose sum is σ = 143077036680. Its totient is φ = 85666775040.

The previous prime is 111223213487. The next prime is 111223213529. The reversal of 111223213525 is 525312322111.

It can be written as a sum of positive squares in 12 ways, for example, as 38494832401 + 72728381124 = 196201^2 + 269682^2 .

It is not a de Polignac number, because 111223213525 - 2²⁵ = 111189659093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111223213493 and 111223213502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111223213529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38629 + ... + 473221.

It is an arithmetic number, because the mean of its divisors is an integer number (5961543195).

Almost surely, 2^111223213525 is an apocalyptic number.

It is an amenable number.

111223213525 is a deficient number, since it is larger than the sum of its proper divisors (31853823155).

111223213525 is a wasteful number, since it uses less digits than its factorization.

111223213525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434985 (or 434980 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

Adding to 111223213525 its reverse (525312322111), we get a palindrome (636535535636).

The spelling of 111223213525 in words is "one hundred eleven billion, two hundred twenty-three million, two hundred thirteen thousand, five hundred twenty-five".