2101320 has 96 divisors (see below), whose sum is σ = 7371000. Its totient is φ = 516096.

The previous prime is 2101313. The next prime is 2101327. The reversal of 2101320 is 231012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2101313) and next prime (2101327).

It can be written as a sum of positive squares in 4 ways, for example, as 1425636 + 675684 = 1194^2 + 822^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2101327) 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, 4456 + ... + 4904.

2^2101320 is an apocalyptic number.

2101320 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 2101320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3685500).

2101320 is an abundant number, since it is smaller than the sum of its proper divisors (5269680).

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

2101320 is a wasteful number, since it uses less digits than its factorization.

2101320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2101320 is about 1449.5930463409. The cubic root of 2101320 is about 128.0847420614.

Adding to 2101320 its reverse (231012), we get a palindrome (2332332).

The spelling of 2101320 in words is "two million, one hundred one thousand, three hundred twenty".