1641434421 has 16 divisors (see below), whose sum is σ = 2426683968. Its totient is φ = 978499200.

The previous prime is 1641434411. The next prime is 1641434449. The reversal of 1641434421 is 1244341461.

It is not a de Polignac number, because 1641434421 - 2⁶ = 1641434357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641434411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405696 + ... + 409721.

It is an arithmetic number, because the mean of its divisors is an integer number (151667748).

Almost surely, 2^1641434421 is an apocalyptic number.

1641434421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1641434421 is a deficient number, since it is larger than the sum of its proper divisors (785249547).

1641434421 is a wasteful number, since it uses less digits than its factorization.

1641434421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815492.

The product of its digits is 9216, while the sum is 30.

The square root of 1641434421 is about 40514.6198427185. The cubic root of 1641434421 is about 1179.6174238546.

Adding to 1641434421 its reverse (1244341461), we get a palindrome (2885775882).

The spelling of 1641434421 in words is "one billion, six hundred forty-one million, four hundred thirty-four thousand, four hundred twenty-one".