21321211230012 has 48 divisors (see below), whose sum is σ = 49919427532800. Its totient is φ = 7082816388288.

The previous prime is 21321211229963. The next prime is 21321211230019. The reversal of 21321211230012 is 21003211212312.

It is a super-4 number, since 4×21321211230012⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321211230019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6238393 + ... + 9031055.

It is an arithmetic number, because the mean of its divisors is an integer number (1039988073600).

Almost surely, 2^{21321211230012} is an apocalyptic number.

It is an amenable number.

21321211230012 is an abundant number, since it is smaller than the sum of its proper divisors (28598216302788).

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

21321211230012 is a wasteful number, since it uses less digits than its factorization.

21321211230012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794842 (or 2794840 counting only the distinct ones).

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

Adding to 21321211230012 its reverse (21003211212312), we get a palindrome (42324422442324).

The spelling of 21321211230012 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred eleven million, two hundred thirty thousand, twelve".