21010020112 has 20 divisors (see below), whose sum is σ = 43101438876. Its totient is φ = 9887068160.

The previous prime is 21010020091. The next prime is 21010020113. The reversal of 21010020112 is 21102001012.

It can be written as a sum of positive squares in 2 ways, for example, as 16673007376 + 4337012736 = 129124^2 + 65856^2 .

It is not an unprimeable number, because it can be changed into a prime (21010020113) 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, 38621089 + ... + 38621632.

Almost surely, 2^21010020112 is an apocalyptic number.

It is an amenable number.

21010020112 is an abundant number, since it is smaller than the sum of its proper divisors (22091418764).

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

21010020112 is a wasteful number, since it uses less digits than its factorization.

21010020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77242746 (or 77242740 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010020112 its reverse (21102001012), we get a palindrome (42112021124).

The spelling of 21010020112 in words is "twenty-one billion, ten million, twenty thousand, one hundred twelve".