421129109 has 2 divisors, whose sum is σ = 421129110. Its totient is φ = 421129108.

The previous prime is 421129087. The next prime is 421129123. The reversal of 421129109 is 901921124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414122500 + 7006609 = 20350^2 + 2647^2 .

It is a cyclic number.

It is not a de Polignac number, because 421129109 - 2⁸ = 421128853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421129139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210564554 + 210564555.

It is an arithmetic number, because the mean of its divisors is an integer number (210564555).

Almost surely, 2^421129109 is an apocalyptic number.

It is an amenable number.

421129109 is a deficient number, since it is larger than the sum of its proper divisors (1).

421129109 is an equidigital number, since it uses as much as digits as its factorization.

421129109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 421129109 is about 20521.4304813285. The cubic root of 421129109 is about 749.5577297658.

The spelling of 421129109 in words is "four hundred twenty-one million, one hundred twenty-nine thousand, one hundred nine".