21011021002212 has 12 divisors (see below), whose sum is σ = 49025715671856. Its totient is φ = 7003673667400.

The previous prime is 21011021002211. The next prime is 21011021002273. The reversal of 21011021002212 is 21220012011012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21011021002191 and 21011021002200.

It is not an unprimeable number, because it can be changed into a prime (21011021002211) 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, 875459208414 + ... + 875459208437.

It is an arithmetic number, because the mean of its divisors is an integer number (4085476305988).

Almost surely, 2^{21011021002212} is an apocalyptic number.

It is an amenable number.

21011021002212 is an abundant number, since it is smaller than the sum of its proper divisors (28014694669644).

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

21011021002212 is a wasteful number, since it uses less digits than its factorization.

21011021002212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750918416858 (or 1750918416856 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011021002212 its reverse (21220012011012), we get a palindrome (42231033013224).

The spelling of 21011021002212 in words is "twenty-one trillion, eleven billion, twenty-one million, two thousand, two hundred twelve".