21313030123212 has 12 divisors (see below), whose sum is σ = 49730403620856. Its totient is φ = 7104343374400.

The previous prime is 21313030123211. The next prime is 21313030123381. The reversal of 21313030123212 is 21232103031312.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21313030123211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888042921789 + ... + 888042921812.

It is an arithmetic number, because the mean of its divisors is an integer number (4144200301738).

Almost surely, 2^{21313030123212} is an apocalyptic number.

It is an amenable number.

21313030123212 is an abundant number, since it is smaller than the sum of its proper divisors (28417373497644).

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

21313030123212 is a wasteful number, since it uses less digits than its factorization.

21313030123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776085843608 (or 1776085843606 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21313030123212 its reverse (21232103031312), we get a palindrome (42545133154524).

The spelling of 21313030123212 in words is "twenty-one trillion, three hundred thirteen billion, thirty million, one hundred twenty-three thousand, two hundred twelve".