4221420421 has 8 divisors (see below), whose sum is σ = 4330811520. Its totient is φ = 4113423072.

The previous prime is 4221420407. The next prime is 4221420431. The reversal of 4221420421 is 1240241224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4221420421 - 2¹¹ = 4221418373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4221420392 and 4221420401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221420431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342301 + ... + 354418.

It is an arithmetic number, because the mean of its divisors is an integer number (541351440).

Almost surely, 2^4221420421 is an apocalyptic number.

It is an amenable number.

4221420421 is a deficient number, since it is larger than the sum of its proper divisors (109391099).

4221420421 is an equidigital number, since it uses as much as digits as its factorization.

4221420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696875.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 4221420421 is about 64972.4589422318. The cubic root of 4221420421 is about 1616.1668788070.

Adding to 4221420421 its reverse (1240241224), we get a palindrome (5461661645).

The spelling of 4221420421 in words is "four billion, two hundred twenty-one million, four hundred twenty thousand, four hundred twenty-one".