2221021212 has 24 divisors (see below), whose sum is σ = 5223192576. Its totient is φ = 734510448.

The previous prime is 2221021189. The next prime is 2221021249. The reversal of 2221021212 is 2121201222.

It is a junction number, because it is equal to n+sod(n) for n = 2221021191 and 2221021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727158 + ... + 730205.

It is an arithmetic number, because the mean of its divisors is an integer number (217633024).

Almost surely, 2^2221021212 is an apocalyptic number.

It is an amenable number.

2221021212 is an abundant number, since it is smaller than the sum of its proper divisors (3002171364).

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

2221021212 is a wasteful number, since it uses less digits than its factorization.

2221021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457497 (or 1457495 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2221021212 is about 47127.7117203880. The cubic root of 2221021212 is about 1304.7207482223.

Adding to 2221021212 its reverse (2121201222), we get a palindrome (4342222434).

The spelling of 2221021212 in words is "two billion, two hundred twenty-one million, twenty-one thousand, two hundred twelve".