2002420421 has 2 divisors, whose sum is σ = 2002420422. Its totient is φ = 2002420420.

The previous prime is 2002420351. The next prime is 2002420451. The reversal of 2002420421 is 1240242002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543389796 + 459030625 = 39286^2 + 21425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002420421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2002420421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002420451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001210210 + 1001210211.

It is an arithmetic number, because the mean of its divisors is an integer number (1001210211).

Almost surely, 2^2002420421 is an apocalyptic number.

It is an amenable number.

2002420421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002420421 is an equidigital number, since it uses as much as digits as its factorization.

2002420421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 2002420421 is about 44748.4124969814. The cubic root of 2002420421 is about 1260.4291015614.

Adding to 2002420421 its reverse (1240242002), we get a palindrome (3242662423).

The spelling of 2002420421 in words is "two billion, two million, four hundred twenty thousand, four hundred twenty-one".