2013621 has 8 divisors (see below), whose sum is σ = 2742144. Its totient is φ = 1313760.

The previous prime is 2013619. The next prime is 2013653. The reversal of 2013621 is 1263102.

2013621 = 469² + 470² + ... + 477².

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

It is not a de Polignac number, because 2013621 - 2¹ = 2013619 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 2013621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013721) 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, 7000 + ... + 7281.

It is an arithmetic number, because the mean of its divisors is an integer number (342768).

2^2013621 is an apocalyptic number.

It is an amenable number.

2013621 is a deficient number, since it is larger than the sum of its proper divisors (728523).

2013621 is a wasteful number, since it uses less digits than its factorization.

2013621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14331.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2013621 is about 1419.0211414916. The cubic root of 2013621 is about 126.2774811921.

Adding to 2013621 its reverse (1263102), we get a palindrome (3276723).

It can be divided in two parts, 201 and 3621, that multiplied together give a triangular number (727821 = T₁₂₀₆).

The spelling of 2013621 in words is "two million, thirteen thousand, six hundred twenty-one".