2181020 has 24 divisors (see below), whose sum is σ = 4614624. Its totient is φ = 865856.

The previous prime is 2181017. The next prime is 2181031. The reversal of 2181020 is 201812.

It is a junction number, because it is equal to n+sod(n) for n = 2180986 and 2181004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3014 + ... + 3666.

It is an arithmetic number, because the mean of its divisors is an integer number (192276).

2^2181020 is an apocalyptic number.

2181020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181020 is an abundant number, since it is smaller than the sum of its proper divisors (2433604).

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

2181020 is a wasteful number, since it uses less digits than its factorization.

2181020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2181020 is about 1476.8276812140. The cubic root of 2181020 is about 129.6840453427.

Adding to 2181020 its reverse (201812), we get a palindrome (2382832).

The spelling of 2181020 in words is "two million, one hundred eighty-one thousand, twenty".