421550429 has 2 divisors, whose sum is σ = 421550430. Its totient is φ = 421550428.

The previous prime is 421550401. The next prime is 421550447. The reversal of 421550429 is 924055124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310816900 + 110733529 = 17630^2 + 10523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421550429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 421550395 and 421550404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421550449) 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, 210775214 + 210775215.

It is an arithmetic number, because the mean of its divisors is an integer number (210775215).

Almost surely, 2^421550429 is an apocalyptic number.

It is an amenable number.

421550429 is a deficient number, since it is larger than the sum of its proper divisors (1).

421550429 is an equidigital number, since it uses as much as digits as its factorization.

421550429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 421550429 is about 20531.6932813638. The cubic root of 421550429 is about 749.8076122831.

The spelling of 421550429 in words is "four hundred twenty-one million, five hundred fifty thousand, four hundred twenty-nine".