421101409 has 2 divisors, whose sum is σ = 421101410. Its totient is φ = 421101408.

The previous prime is 421101397. The next prime is 421101433. The reversal of 421101409 is 904101124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310746384 + 110355025 = 17628^2 + 10505^2 .

It is a cyclic number.

It is not a de Polignac number, because 421101409 - 2¹³ = 421093217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421101409.

It is not a weakly prime, because it can be changed into another prime (421101479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210550704 + 210550705.

It is an arithmetic number, because the mean of its divisors is an integer number (210550705).

Almost surely, 2^421101409 is an apocalyptic number.

It is an amenable number.

421101409 is a deficient number, since it is larger than the sum of its proper divisors (1).

421101409 is an equidigital number, since it uses as much as digits as its factorization.

421101409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 421101409 is about 20520.7555660117. The cubic root of 421101409 is about 749.5412952141.

The spelling of 421101409 in words is "four hundred twenty-one million, one hundred one thousand, four hundred nine".