21211001220212 has 12 divisors (see below), whose sum is σ = 37217192117280. Its totient is φ = 10577517758136.

The previous prime is 21211001220179. The next prime is 21211001220217. The reversal of 21211001220212 is 21202210011212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211001220217) 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, 6995711288 + ... + 6995714319.

It is an arithmetic number, because the mean of its divisors is an integer number (3101432676440).

Almost surely, 2^{21211001220212} is an apocalyptic number.

It is an amenable number.

21211001220212 is a deficient number, since it is larger than the sum of its proper divisors (16006190897068).

21211001220212 is a wasteful number, since it uses less digits than its factorization.

21211001220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13991425990 (or 13991425988 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211001220212 its reverse (21202210011212), we get a palindrome (42413211231424).

The spelling of 21211001220212 in words is "twenty-one trillion, two hundred eleven billion, one million, two hundred twenty thousand, two hundred twelve".