20430032221 has 16 divisors (see below), whose sum is σ = 21402723888. Its totient is φ = 19481817600.

The previous prime is 20430032197. The next prime is 20430032263. The reversal of 20430032221 is 12223003402.

It can be written as a sum of positive squares in 8 ways, for example, as 1555119225 + 18874912996 = 39435^2 + 137386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430032221 - 2⁹ = 20430031709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430032921) 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, 618111 + ... + 650323.

It is an arithmetic number, because the mean of its divisors is an integer number (1337670243).

Almost surely, 2^20430032221 is an apocalyptic number.

It is an amenable number.

20430032221 is a deficient number, since it is larger than the sum of its proper divisors (972691667).

20430032221 is a wasteful number, since it uses less digits than its factorization.

20430032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32592.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20430032221 its reverse (12223003402), we get a palindrome (32653035623).

The spelling of 20430032221 in words is "twenty billion, four hundred thirty million, thirty-two thousand, two hundred twenty-one".