421207229 has 2 divisors, whose sum is σ = 421207230. Its totient is φ = 421207228.

The previous prime is 421207217. The next prime is 421207277. The reversal of 421207229 is 922702124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395095129 + 26112100 = 19877^2 + 5110^2 .

It is a cyclic number.

It is not a de Polignac number, because 421207229 - 2²⁰ = 420158653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421207289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210603614 + 210603615.

It is an arithmetic number, because the mean of its divisors is an integer number (210603615).

Almost surely, 2^421207229 is an apocalyptic number.

It is an amenable number.

421207229 is a deficient number, since it is larger than the sum of its proper divisors (1).

421207229 is an equidigital number, since it uses as much as digits as its factorization.

421207229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 421207229 is about 20523.3337691516. Note that the first 3 decimals coincide. The cubic root of 421207229 is about 749.6040748797.

The spelling of 421207229 in words is "four hundred twenty-one million, two hundred seven thousand, two hundred twenty-nine".