4021424430421 has 2 divisors, whose sum is σ = 4021424430422. Its totient is φ = 4021424430420.

The previous prime is 4021424430409. The next prime is 4021424430427. The reversal of 4021424430421 is 1240344241204.

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., 4007003062500 + 14421367921 = 2001750^2 + 120089^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021424430421 - 2⁷ = 4021424430293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021424430427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010712215210 + 2010712215211.

It is an arithmetic number, because the mean of its divisors is an integer number (2010712215211).

Almost surely, 2^{4021424430421} is an apocalyptic number.

It is an amenable number.

4021424430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021424430421 is an equidigital number, since it uses as much as digits as its factorization.

4021424430421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 4021424430421 its reverse (1240344241204), we get a palindrome (5261768671625).

The spelling of 4021424430421 in words is "four trillion, twenty-one billion, four hundred twenty-four million, four hundred thirty thousand, four hundred twenty-one".