2421220421 has 2 divisors, whose sum is σ = 2421220422. Its totient is φ = 2421220420.

The previous prime is 2421220397. The next prime is 2421220471. The reversal of 2421220421 is 1240221242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485717025 + 935503396 = 38545^2 + 30586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421220421 - 2³⁰ = 1347478597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2421220393 and 2421220402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421220471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210610210 + 1210610211.

It is an arithmetic number, because the mean of its divisors is an integer number (1210610211).

Almost surely, 2^2421220421 is an apocalyptic number.

It is an amenable number.

2421220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421220421 is an equidigital number, since it uses as much as digits as its factorization.

2421220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2421220421 is about 49205.8982338500. The cubic root of 2421220421 is about 1342.8003405682.

Adding to 2421220421 its reverse (1240221242), we get a palindrome (3661441663).

The spelling of 2421220421 in words is "two billion, four hundred twenty-one million, two hundred twenty thousand, four hundred twenty-one".