2161020 has 24 divisors (see below), whose sum is σ = 6051024. Its totient is φ = 576256.

The previous prime is 2161007. The next prime is 2161031. The reversal of 2161020 is 201612.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2160987 and 2161005.

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, 17949 + ... + 18068.

It is an arithmetic number, because the mean of its divisors is an integer number (252126).

2^2161020 is an apocalyptic number.

2161020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161020 is an abundant number, since it is smaller than the sum of its proper divisors (3890004).

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

2161020 is a wasteful number, since it uses less digits than its factorization.

2161020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36029 (or 36027 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2161020 is about 1470.0408157599. The cubic root of 2161020 is about 129.2864256387.

Adding to 2161020 its reverse (201612), we get a palindrome (2362632).

The spelling of 2161020 in words is "two million, one hundred sixty-one thousand, twenty".