409221421 has 16 divisors (see below), whose sum is σ = 486277120. Its totient is φ = 336979440.

The previous prime is 409221409. The next prime is 409221437. The reversal of 409221421 is 124122904.

It is not a de Polignac number, because 409221421 - 2⁵ = 409221389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409221401) 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 in 15 ways as a sum of consecutive naturals, for example, 23380 + ... + 36946.

It is an arithmetic number, because the mean of its divisors is an integer number (30392320).

Almost surely, 2^409221421 is an apocalyptic number.

It is an amenable number.

409221421 is a deficient number, since it is larger than the sum of its proper divisors (77055699).

409221421 is a wasteful number, since it uses less digits than its factorization.

409221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 409221421 is about 20229.2219573566. The cubic root of 409221421 is about 742.4253397176.

The spelling of 409221421 in words is "four hundred nine million, two hundred twenty-one thousand, four hundred twenty-one".