424221401 has 2 divisors, whose sum is σ = 424221402. Its totient is φ = 424221400.

The previous prime is 424221397. The next prime is 424221403. The reversal of 424221401 is 104122424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422261401 + 1960000 = 20549^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 424221401 - 2² = 424221397 is a prime.

Together with 424221403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (424221403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212110700 + 212110701.

It is an arithmetic number, because the mean of its divisors is an integer number (212110701).

Almost surely, 2^424221401 is an apocalyptic number.

It is an amenable number.

424221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

424221401 is an equidigital number, since it uses as much as digits as its factorization.

424221401 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 424221401 is about 20596.6356718761. The cubic root of 424221401 is about 751.3878899496.

Adding to 424221401 its reverse (104122424), we get a palindrome (528343825).

The spelling of 424221401 in words is "four hundred twenty-four million, two hundred twenty-one thousand, four hundred one".