111011606621 has 4 divisors (see below), whose sum is σ = 111224681244. Its totient is φ = 110798532000.

The previous prime is 111011606611. The next prime is 111011606623. The reversal of 111011606621 is 126606110111.

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 53081856025 + 57929750596 = 230395^2 + 240686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111011606621 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 (111011606623) 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, 106536530 + ... + 106537571.

It is an arithmetic number, because the mean of its divisors is an integer number (27806170311).

Almost surely, 2^111011606621 is an apocalyptic number.

It is an amenable number.

111011606621 is a deficient number, since it is larger than the sum of its proper divisors (213074623).

111011606621 is an equidigital number, since it uses as much as digits as its factorization.

111011606621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213074622.

The product of its (nonzero) digits is 432, while the sum is 26.

Adding to 111011606621 its reverse (126606110111), we get a palindrome (237617716732).

The spelling of 111011606621 in words is "one hundred eleven billion, eleven million, six hundred six thousand, six hundred twenty-one".