16118264021 has 4 divisors (see below), whose sum is σ = 16122068844. Its totient is φ = 16114459200.

The previous prime is 16118263999. The next prime is 16118264023. The reversal of 16118264021 is 12046281161.

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 12844822225 + 3273441796 = 113335^2 + 57214^2 .

It is a cyclic number.

It is not a de Polignac number, because 16118264021 - 2⁶ = 16118263957 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 (16118264023) 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, 1896050 + ... + 1904531.

It is an arithmetic number, because the mean of its divisors is an integer number (4030517211).

Almost surely, 2^16118264021 is an apocalyptic number.

It is an amenable number.

16118264021 is a deficient number, since it is larger than the sum of its proper divisors (3804823).

16118264021 is an equidigital number, since it uses as much as digits as its factorization.

16118264021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804822.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 16118264021 in words is "sixteen billion, one hundred eighteen million, two hundred sixty-four thousand, twenty-one".