16149162121 has 4 divisors (see below), whose sum is σ = 17099112852. Its totient is φ = 15199211392.

The previous prime is 16149162089. The next prime is 16149162131. The reversal of 16149162121 is 12126194161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12126194161 = 110119².

It can be written as a sum of positive squares in 2 ways, for example, as 8660163600 + 7488998521 = 93060^2 + 86539^2 .

It is a cyclic number.

It is not a de Polignac number, because 16149162121 - 2⁵ = 16149162089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16149162131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474975340 + ... + 474975373.

It is an arithmetic number, because the mean of its divisors is an integer number (4274778213).

Almost surely, 2^16149162121 is an apocalyptic number.

It is an amenable number.

16149162121 is a deficient number, since it is larger than the sum of its proper divisors (949950731).

16149162121 is an equidigital number, since it uses as much as digits as its factorization.

16149162121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949950730.

The product of its digits is 5184, while the sum is 34.

The spelling of 16149162121 in words is "sixteen billion, one hundred forty-nine million, one hundred sixty-two thousand, one hundred twenty-one".