2131220 has 48 divisors (see below), whose sum is σ = 5513088. Its totient is φ = 673920.

The previous prime is 2131193. The next prime is 2131223. The reversal of 2131220 is 221312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1235 + ... + 2405.

It is an arithmetic number, because the mean of its divisors is an integer number (114856).

2^2131220 is an apocalyptic number.

2131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2756544).

2131220 is an abundant number, since it is smaller than the sum of its proper divisors (3381868).

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

2131220 is a wasteful number, since it uses less digits than its factorization.

2131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2131220 is about 1459.8698572133. The cubic root of 2131220 is about 128.6893955510.

Adding to 2131220 its reverse (221312), we get a palindrome (2352532).

The spelling of 2131220 in words is "two million, one hundred thirty-one thousand, two hundred twenty".