111655021213 has 4 divisors (see below), whose sum is σ = 112049562208. Its totient is φ = 111260480220.

The previous prime is 111655021207. The next prime is 111655021253. The reversal of 111655021213 is 312120556111.

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 111655021213 - 2¹³ = 111655013021 is a prime.

It is a super-3 number, since 3×111655021213³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111655021253) 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, 197270073 + ... + 197270638.

It is an arithmetic number, because the mean of its divisors is an integer number (28012390552).

Almost surely, 2^111655021213 is an apocalyptic number.

It is an amenable number.

111655021213 is a deficient number, since it is larger than the sum of its proper divisors (394540995).

111655021213 is an equidigital number, since it uses as much as digits as its factorization.

111655021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394540994.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 111655021213 its reverse (312120556111), we get a palindrome (423775577324).

It can be divided in two parts, 11165 and 5021213, that added together give a triangular number (5032378 = T₃₁₇₂).

The spelling of 111655021213 in words is "one hundred eleven billion, six hundred fifty-five million, twenty-one thousand, two hundred thirteen".