21010002212 has 12 divisors (see below), whose sum is σ = 37124470656. Its totient is φ = 10403010600.

The previous prime is 21010002203. The next prime is 21010002253. The reversal of 21010002212 is 21220001012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010002193 and 21010002202.

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, 25497164 + ... + 25497987.

It is an arithmetic number, because the mean of its divisors is an integer number (3093705888).

Almost surely, 2^21010002212 is an apocalyptic number.

It is an amenable number.

21010002212 is a deficient number, since it is larger than the sum of its proper divisors (16114468444).

21010002212 is a wasteful number, since it uses less digits than its factorization.

21010002212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50995258 (or 50995256 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21010002212 its reverse (21220001012), we get a palindrome (42230003224).

The spelling of 21010002212 in words is "twenty-one billion, ten million, two thousand, two hundred twelve".