2420809421 has 4 divisors (see below), whose sum is σ = 2422103772. Its totient is φ = 2419515072.

The previous prime is 2420809387. The next prime is 2420809427. The reversal of 2420809421 is 1249080242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1249080242 = 2 ⋅624540121.

It can be written as a sum of positive squares in 2 ways, for example, as 190136521 + 2230672900 = 13789^2 + 47230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2420809421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2420809427) 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, 644366 + ... + 648111.

It is an arithmetic number, because the mean of its divisors is an integer number (605525943).

Almost surely, 2^2420809421 is an apocalyptic number.

It is an amenable number.

2420809421 is a deficient number, since it is larger than the sum of its proper divisors (1294351).

2420809421 is a wasteful number, since it uses less digits than its factorization.

2420809421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294350.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2420809421 is about 49201.7217280046. The cubic root of 2420809421 is about 1342.7243565498.

Adding to 2420809421 its reverse (1249080242), we get a palindrome (3669889663).

The spelling of 2420809421 in words is "two billion, four hundred twenty million, eight hundred nine thousand, four hundred twenty-one".