2312212221 has 24 divisors (see below), whose sum is σ = 3761022720. Its totient is φ = 1356134400.

The previous prime is 2312212219. The next prime is 2312212229. The reversal of 2312212221 is 1222122132.

2312212221 is a `hidden beast` number, since 231 + 2 + 212 + 221 = 666.

It is not a de Polignac number, because 2312212221 - 2¹ = 2312212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2312212194 and 2312212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312212229) 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, 373636 + ... + 379773.

It is an arithmetic number, because the mean of its divisors is an integer number (156709280).

Almost surely, 2^2312212221 is an apocalyptic number.

It is an amenable number.

2312212221 is a deficient number, since it is larger than the sum of its proper divisors (1448810499).

2312212221 is a wasteful number, since it uses less digits than its factorization.

2312212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753457 (or 753454 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2312212221 is about 48085.4678775199. The cubic root of 2312212221 is about 1322.3382608393.

Adding to 2312212221 its reverse (1222122132), we get a palindrome (3534334353).

The spelling of 2312212221 in words is "two billion, three hundred twelve million, two hundred twelve thousand, two hundred twenty-one".