12164071821 has 16 divisors (see below), whose sum is σ = 17731104768. Its totient is φ = 7356369200.

The previous prime is 12164071783. The next prime is 12164071823. The reversal of 12164071821 is 12817046121.

It is a cyclic number.

It is not a de Polignac number, because 12164071821 - 2¹⁰ = 12164070797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12164071823) 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 15 ways as a sum of consecutive naturals, for example, 379245 + ... + 410066.

It is an arithmetic number, because the mean of its divisors is an integer number (1108194048).

Almost surely, 2^12164071821 is an apocalyptic number.

12164071821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12164071821 is a deficient number, since it is larger than the sum of its proper divisors (5567032947).

12164071821 is a wasteful number, since it uses less digits than its factorization.

12164071821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789792.

The product of its (nonzero) digits is 5376, while the sum is 33.

The spelling of 12164071821 in words is "twelve billion, one hundred sixty-four million, seventy-one thousand, eight hundred twenty-one".