21113311412 has 24 divisors (see below), whose sum is σ = 37464335496. Its totient is φ = 10409292288.

The previous prime is 21113311379. The next prime is 21113311433. The reversal of 21113311412 is 21411331112.

It can be written as a sum of positive squares in 4 ways, for example, as 4484177296 + 16629134116 = 66964^2 + 128954^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1510568 + ... + 1524480.

It is an arithmetic number, because the mean of its divisors is an integer number (1561013979).

Almost surely, 2^21113311412 is an apocalyptic number.

It is an amenable number.

21113311412 is a deficient number, since it is larger than the sum of its proper divisors (16351024084).

21113311412 is a wasteful number, since it uses less digits than its factorization.

21113311412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19187 (or 19185 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 21113311412 its reverse (21411331112), we get a palindrome (42524642524).

The spelling of 21113311412 in words is "twenty-one billion, one hundred thirteen million, three hundred eleven thousand, four hundred twelve".