21321121101012 has 18 divisors (see below), whose sum is σ = 53895056116538. Its totient is φ = 7107040366992.

The previous prime is 21321121100977. The next prime is 21321121101083. The reversal of 21321121101012 is 21010112112312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18351165198276 + 2969955902736 = 4283826^2 + 1723356^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 296126681923 + ... + 296126681994.

Almost surely, 2^{21321121101012} is an apocalyptic number.

It is an amenable number.

21321121101012 is an abundant number, since it is smaller than the sum of its proper divisors (32573935015526).

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

21321121101012 is a wasteful number, since it uses less digits than its factorization.

21321121101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592253363927 (or 592253363922 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21321121101012 its reverse (21010112112312), we get a palindrome (42331233213324).

The spelling of 21321121101012 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, twelve".