3213111220 has 96 divisors (see below), whose sum is σ = 7537743360. Its totient is φ = 1140572160.

The previous prime is 3213111217. The next prime is 3213111227. The reversal of 3213111220 is 221113123.

It is a junction number, because it is equal to n+sod(n) for n = 3213111194 and 3213111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213111227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2786164 + ... + 2787316.

It is an arithmetic number, because the mean of its divisors is an integer number (78518160).

Almost surely, 2^3213111220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3213111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3768871680).

3213111220 is an abundant number, since it is smaller than the sum of its proper divisors (4324632140).

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

3213111220 is a wasteful number, since it uses less digits than its factorization.

3213111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3213111220 is about 56684.3119390189. The cubic root of 3213111220 is about 1475.6224464753.

Adding to 3213111220 its reverse (221113123), we get a palindrome (3434224343).

The spelling of 3213111220 in words is "three billion, two hundred thirteen million, one hundred eleven thousand, two hundred twenty".