3211122221 has 4 divisors (see below), whose sum is σ = 3211791744. Its totient is φ = 3210452700.

The previous prime is 3211122217. The next prime is 3211122247. The reversal of 3211122221 is 1222211123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3211122221 - 2² = 3211122217 is a prime.

It is a super-3 number, since 3×3211122221³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3211122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3211122521) 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, 327515 + ... + 337176.

It is an arithmetic number, because the mean of its divisors is an integer number (802947936).

Almost surely, 2^3211122221 is an apocalyptic number.

It is an amenable number.

3211122221 is a deficient number, since it is larger than the sum of its proper divisors (669523).

3211122221 is an equidigital number, since it uses as much as digits as its factorization.

3211122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669522.

The product of its digits is 96, while the sum is 17.

The square root of 3211122221 is about 56666.7646950132. The cubic root of 3211122221 is about 1475.3179007984.

Adding to 3211122221 its reverse (1222211123), we get a palindrome (4433333344).

The spelling of 3211122221 in words is "three billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".