212103310221 has 24 divisors (see below), whose sum is σ = 345748347360. Its totient is φ = 124114788000.

The previous prime is 212103310193. The next prime is 212103310241. The reversal of 212103310221 is 122013301212.

It is not a de Polignac number, because 212103310221 - 2¹⁴ = 212103293837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212103310194 and 212103310203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212103310241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36936055 + ... + 36941796.

It is an arithmetic number, because the mean of its divisors is an integer number (14406181140).

Almost surely, 2^212103310221 is an apocalyptic number.

It is an amenable number.

212103310221 is a deficient number, since it is larger than the sum of its proper divisors (133645037139).

212103310221 is a wasteful number, since it uses less digits than its factorization.

212103310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73877897 (or 73877894 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 212103310221 its reverse (122013301212), we get a palindrome (334116611433).

Subtracting from 212103310221 its reverse (122013301212), we obtain a palindrome (90090009009).

The spelling of 212103310221 in words is "two hundred twelve billion, one hundred three million, three hundred ten thousand, two hundred twenty-one".