2081621 has 8 divisors (see below), whose sum is σ = 2217600. Its totient is φ = 1948320.

The previous prime is 2081617. The next prime is 2081627. The reversal of 2081621 is 1261802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2081621 - 2² = 2081617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2081593 and 2081602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1076 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (277200).

2^2081621 is an apocalyptic number.

It is an amenable number.

2081621 is a deficient number, since it is larger than the sum of its proper divisors (135979).

2081621 is a wasteful number, since it uses less digits than its factorization.

2081621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2081621 is about 1442.7823813729. The cubic root of 2081621 is about 127.6832377496.

The spelling of 2081621 in words is "two million, eighty-one thousand, six hundred twenty-one".