21210001111012 has 24 divisors (see below), whose sum is σ = 44652633919040. Its totient is φ = 8611579398240.

The previous prime is 21210001111003. The next prime is 21210001111129. The reversal of 21210001111012 is 21011110001212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210001110983 and 21210001111001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19934211039 + ... + 19934212102.

Almost surely, 2^{21210001111012} is an apocalyptic number.

It is an amenable number.

21210001111012 is an abundant number, since it is smaller than the sum of its proper divisors (23442632808028).

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

21210001111012 is a wasteful number, since it uses less digits than its factorization.

21210001111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39868423171 (or 39868423169 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210001111012 its reverse (21011110001212), we get a palindrome (42221111112224).

The spelling of 21210001111012 in words is "twenty-one trillion, two hundred ten billion, one million, one hundred eleven thousand, twelve".