21321103021212 has 12 divisors (see below), whose sum is σ = 49749240382856. Its totient is φ = 7107034340400.

The previous prime is 21321103021189. The next prime is 21321103021217. The reversal of 21321103021212 is 21212030112312.

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

It is a super-2 number, since 2×21321103021212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321103021217) 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, 888379292539 + ... + 888379292562.

Almost surely, 2^{21321103021212} is an apocalyptic number.

It is an amenable number.

21321103021212 is an abundant number, since it is smaller than the sum of its proper divisors (28428137361644).

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

21321103021212 is a wasteful number, since it uses less digits than its factorization.

21321103021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776758585108 (or 1776758585106 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21321103021212 its reverse (21212030112312), we get a palindrome (42533133133524).

The spelling of 21321103021212 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred three million, twenty-one thousand, two hundred twelve".