2001621 has 8 divisors (see below), whose sum is σ = 2784960. Its totient is φ = 1276352.

The previous prime is 2001619. The next prime is 2001641. The reversal of 2001621 is 1261002.

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 2001621 - 2¹ = 2001619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001597 and 2001606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14436 + ... + 14573.

It is an arithmetic number, because the mean of its divisors is an integer number (348120).

2^2001621 is an apocalyptic number.

It is an amenable number.

2001621 is a deficient number, since it is larger than the sum of its proper divisors (783339).

2001621 is a wasteful number, since it uses less digits than its factorization.

2001621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29035.

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

The square root of 2001621 is about 1414.7865563399. The cubic root of 2001621 is about 126.0261346645.

Adding to 2001621 its reverse (1261002), we get a palindrome (3262623).

The spelling of 2001621 in words is "two million, one thousand, six hundred twenty-one".