2420021 has 4 divisors (see below), whose sum is σ = 2503500.
Its totient is φ = 2336544.
The previous prime is 2420017. The next prime is 2420051. The reversal of 2420021 is 1200242.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 703921 + 1716100 = 839^2 + 1310^2
It is a cyclic number.
It is not a de Polignac number, because 2420021 - 22 = 2420017 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2419984 and 2420011.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2420051) 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, 41696 + ... + 41753.
It is an arithmetic number, because the mean of its divisors is an integer number (625875).
22420021 is an apocalyptic number.
It is an amenable number.
2420021 is a deficient number, since it is larger than the sum of its proper divisors (83479).
2420021 is an equidigital number, since it uses as much as digits as its factorization.
2420021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 83478.
The product of its (nonzero) digits is 32, while the sum is 11.
The square root of 2420021 is about 1555.6416682514.
The cubic root of 2420021 is about 134.2578572387.
Adding to 2420021 its reverse (1200242), we get a palindrome (3620263).
The spelling of 2420021 in words is "two million, four hundred twenty thousand, twenty-one".