21164133412 has 12 divisors (see below), whose sum is σ = 37041224220. Its totient is φ = 10580926496.

The previous prime is 21164133409. The next prime is 21164133413. The reversal of 21164133412 is 21433146112.

It can be written as a sum of positive squares in 2 ways, for example, as 6777570276 + 14386563136 = 82326^2 + 119944^2 .

It is not an unprimeable number, because it can be changed into a prime (21164133413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242587 + ... + 318082.

It is an arithmetic number, because the mean of its divisors is an integer number (3086768685).

Almost surely, 2^21164133412 is an apocalyptic number.

It is an amenable number.

21164133412 is a deficient number, since it is larger than the sum of its proper divisors (15877090808).

21164133412 is a wasteful number, since it uses less digits than its factorization.

21164133412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570110 (or 570108 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

Adding to 21164133412 its reverse (21433146112), we get a palindrome (42597279524).

The spelling of 21164133412 in words is "twenty-one billion, one hundred sixty-four million, one hundred thirty-three thousand, four hundred twelve".