211021021212 has 24 divisors (see below), whose sum is σ = 492527680512. Its totient is φ = 70319583600.

The previous prime is 211021021171. The next prime is 211021021213. The reversal of 211021021212 is 212120120112.

It is a junction number, because it is equal to n+sod(n) for n = 211021021191 and 211021021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552214 + ... + 2633597.

It is an arithmetic number, because the mean of its divisors is an integer number (20521986688).

Almost surely, 2^211021021212 is an apocalyptic number.

It is an amenable number.

211021021212 is an abundant number, since it is smaller than the sum of its proper divisors (281506659300).

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

211021021212 is a wasteful number, since it uses less digits than its factorization.

211021021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189209 (or 5189207 counting only the distinct ones).

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

Adding to 211021021212 its reverse (212120120112), we get a palindrome (423141141324).

The spelling of 211021021212 in words is "two hundred eleven billion, twenty-one million, twenty-one thousand, two hundred twelve".