21216042202112 has 44 divisors (see below), whose sum is σ = 42626652138180. Its totient is φ = 10554173177856.

The previous prime is 21216042202079. The next prime is 21216042202141. The reversal of 21216042202112 is 21120224061212.

It can be written as a sum of positive squares in 2 ways, for example, as 19449652350976 + 1766389851136 = 4410176^2 + 1329056^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52384037 + ... + 52787492.

It is an arithmetic number, because the mean of its divisors is an integer number (968787548595).

Almost surely, 2^{21216042202112} is an apocalyptic number.

It is an amenable number.

21216042202112 is an abundant number, since it is smaller than the sum of its proper divisors (21410609936068).

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

21216042202112 is a wasteful number, since it uses less digits than its factorization.

21216042202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105171746 (or 105171728 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21216042202112 its reverse (21120224061212), we get a palindrome (42336266263324).

The spelling of 21216042202112 in words is "twenty-one trillion, two hundred sixteen billion, forty-two million, two hundred two thousand, one hundred twelve".