4124020421 has 2 divisors, whose sum is σ = 4124020422. Its totient is φ = 4124020420.

The previous prime is 4124020403. The next prime is 4124020423. The reversal of 4124020421 is 1240204214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3808247521 + 315772900 = 61711^2 + 17770^2 .

It is a cyclic number.

It is not a de Polignac number, because 4124020421 - 2¹⁰ = 4124019397 is a prime.

Together with 4124020423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4124020393 and 4124020402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4124020423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2062010210 + 2062010211.

It is an arithmetic number, because the mean of its divisors is an integer number (2062010211).

Almost surely, 2^4124020421 is an apocalyptic number.

It is an amenable number.

4124020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4124020421 is an equidigital number, since it uses as much as digits as its factorization.

4124020421 is an evil number, because the sum of its binary digits is even.

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

The square root of 4124020421 is about 64218.5364283553. The cubic root of 4124020421 is about 1603.6402041082.

Adding to 4124020421 its reverse (1240204214), we get a palindrome (5364224635).

The spelling of 4124020421 in words is "four billion, one hundred twenty-four million, twenty thousand, four hundred twenty-one".