421254401 has 2 divisors, whose sum is σ = 421254402. Its totient is φ = 421254400.

The previous prime is 421254397. The next prime is 421254403. The reversal of 421254401 is 104452124.

Added to its reverse (104452124) it gives a triangular number (525706525 = T₃₂₄₂₅).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336172225 + 85082176 = 18335^2 + 9224^2 .

It is a cyclic number.

It is not a de Polignac number, because 421254401 - 2² = 421254397 is a prime.

Together with 421254403, 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 (421254403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210627200 + 210627201.

It is an arithmetic number, because the mean of its divisors is an integer number (210627201).

Almost surely, 2^421254401 is an apocalyptic number.

It is an amenable number.

421254401 is a deficient number, since it is larger than the sum of its proper divisors (1).

421254401 is an equidigital number, since it uses as much as digits as its factorization.

421254401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 421254401 is about 20524.4829654732. The cubic root of 421254401 is about 749.6320571499.

Adding to 421254401 its reverse (104452124), we get a triangular number (525706525 = T₃₂₄₂₅).

The spelling of 421254401 in words is "four hundred twenty-one million, two hundred fifty-four thousand, four hundred one".