16121440111 has 4 divisors (see below), whose sum is σ = 18424502992. Its totient is φ = 13818377232.

The previous prime is 16121440109. The next prime is 16121440133. The reversal of 16121440111 is 11104412161.

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

It is a cyclic number.

It is not a de Polignac number, because 16121440111 - 2¹ = 16121440109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121440151) 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, 1151531430 + ... + 1151531443.

It is an arithmetic number, because the mean of its divisors is an integer number (4606125748).

Almost surely, 2^16121440111 is an apocalyptic number.

16121440111 is a deficient number, since it is larger than the sum of its proper divisors (2303062881).

16121440111 is an equidigital number, since it uses as much as digits as its factorization.

16121440111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303062880.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 16121440111 its reverse (11104412161), we get a palindrome (27225852272).

The spelling of 16121440111 in words is "sixteen billion, one hundred twenty-one million, four hundred forty thousand, one hundred eleven".