16111110621 has 8 divisors (see below), whose sum is σ = 21784037184. Its totient is φ = 10589462240.

The previous prime is 16111110619. The next prime is 16111110649. The reversal of 16111110621 is 12601111161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16111110621 - 2¹ = 16111110619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16111110121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37819296 + ... + 37819721.

It is an arithmetic number, because the mean of its divisors is an integer number (2723004648).

Almost surely, 2^16111110621 is an apocalyptic number.

It is an amenable number.

16111110621 is a deficient number, since it is larger than the sum of its proper divisors (5672926563).

16111110621 is an equidigital number, since it uses as much as digits as its factorization.

16111110621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75639091.

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 16111110621 its reverse (12601111161), we get a palindrome (28712221782).

The spelling of 16111110621 in words is "sixteen billion, one hundred eleven million, one hundred ten thousand, six hundred twenty-one".