21234104012 has 48 divisors (see below), whose sum is σ = 41284857600. Its totient is φ = 9474480960.

The previous prime is 21234103993. The next prime is 21234104029. The reversal of 21234104012 is 21040143212.

It is a super-2 number, since 2×21234104012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897289 + ... + 1908447.

It is an arithmetic number, because the mean of its divisors is an integer number (860101200).

Almost surely, 2^21234104012 is an apocalyptic number.

21234104012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21234104012 is a deficient number, since it is larger than the sum of its proper divisors (20050753588).

21234104012 is a wasteful number, since it uses less digits than its factorization.

21234104012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11966 (or 11964 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21234104012 its reverse (21040143212), we get a palindrome (42274247224).

The spelling of 21234104012 in words is "twenty-one billion, two hundred thirty-four million, one hundred four thousand, twelve".