21311213230412 has 72 divisors (see below), whose sum is σ = 43642741519440. Its totient is φ = 9078829038720.

The previous prime is 21311213230367. The next prime is 21311213230519. The reversal of 21311213230412 is 21403231211312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183689462 + ... + 183805442.

It is an arithmetic number, because the mean of its divisors is an integer number (606149187770).

Almost surely, 2^{21311213230412} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21311213230412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21821370759720).

21311213230412 is an abundant number, since it is smaller than the sum of its proper divisors (22331528289028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311213230412 is a wasteful number, since it uses less digits than its factorization.

21311213230412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121591 (or 121582 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21311213230412 its reverse (21403231211312), we get a palindrome (42714444441724).

The spelling of 21311213230412 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirteen million, two hundred thirty thousand, four hundred twelve".