2421009 has 22 divisors (see below), whose sum is σ = 3720066. Its totient is φ = 1574640.

The previous prime is 2420993. The next prime is 2421031. The reversal of 2421009 is 9001242.

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 944784 = 1215^2 + 972^2 .

It is not a de Polignac number, because 2421009 - 2⁴ = 2420993 is a prime.

It is a super-2 number, since 2×2421009² = 11722569156162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2420982 and 2421000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421109) by changing a digit.

It is a polite number, since it can be written in 21 ways as a sum of consecutive naturals, for example, 59029 + ... + 59069.

2^2421009 is an apocalyptic number.

It is an amenable number.

2421009 is a deficient number, since it is larger than the sum of its proper divisors (1299057).

2421009 is an frugal number, since it uses more digits than its factorization.

2421009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 44 counting only the distinct ones).

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

The square root of 2421009 is about 1555.9591896962. The cubic root of 2421009 is about 134.2761254983.

The spelling of 2421009 in words is "two million, four hundred twenty-one thousand, nine".