2642021 has 4 divisors (see below), whose sum is σ = 2797452. Its totient is φ = 2486592.

The previous prime is 2641993. The next prime is 2642039. The reversal of 2642021 is 1202462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202462 = 2 ⋅601231.

It can be written as a sum of positive squares in 2 ways, for example, as 1079521 + 1562500 = 1039^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642021 - 2¹⁰ = 2640997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 155413 = 2642021 / (2 + 6 + 4 + 2 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2642041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77690 + ... + 77723.

It is an arithmetic number, because the mean of its divisors is an integer number (699363).

2^2642021 is an apocalyptic number.

It is an amenable number.

2642021 is a deficient number, since it is larger than the sum of its proper divisors (155431).

2642021 is a wasteful number, since it uses less digits than its factorization.

2642021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155430.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2642021 is about 1625.4294817063. The cubic root of 2642021 is about 138.2437231938.

Adding to 2642021 its reverse (1202462), we get a palindrome (3844483).

The spelling of 2642021 in words is "two million, six hundred forty-two thousand, twenty-one".