2661021 has 12 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 1612680.

The previous prime is 2661013. The next prime is 2661067. The reversal of 2661021 is 1201662.

It is a happy number.

2661021 is a `hidden beast` number, since 2 + 661 + 0 + 2 + 1 = 666.

2661021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2661021 - 2³ = 2661013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2660985 and 2661003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13341 + ... + 13538.

It is an arithmetic number, because the mean of its divisors is an integer number (349440).

2^2661021 is an apocalyptic number.

It is an amenable number.

2661021 is a deficient number, since it is larger than the sum of its proper divisors (1532259).

2661021 is a wasteful number, since it uses less digits than its factorization.

2661021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26896 (or 26893 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2661021 is about 1631.2636206328. The cubic root of 2661021 is about 138.5743235608.

Adding to 2661021 its reverse (1201662), we get a palindrome (3862683).

The spelling of 2661021 in words is "two million, six hundred sixty-one thousand, twenty-one".