21433404321 has 24 divisors (see below), whose sum is σ = 35808427200. Its totient is φ = 12100094496.

The previous prime is 21433404287. The next prime is 21433404337. The reversal of 21433404321 is 12340433412.

21433404321 is a `hidden beast` number, since 2 + 1 + 4 + 334 + 0 + 4 + 321 = 666.

It is not a de Polignac number, because 21433404321 - 2⁶ = 21433404257 is a prime.

It is a super-2 number, since 2×21433404321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21433404341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2044246 + ... + 2054703.

It is an arithmetic number, because the mean of its divisors is an integer number (1492017800).

Almost surely, 2^21433404321 is an apocalyptic number.

21433404321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21433404321 is a deficient number, since it is larger than the sum of its proper divisors (14375022879).

21433404321 is a wasteful number, since it uses less digits than its factorization.

21433404321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099045 (or 4099042 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21433404321 its reverse (12340433412), we get a palindrome (33773837733).

The spelling of 21433404321 in words is "twenty-one billion, four hundred thirty-three million, four hundred four thousand, three hundred twenty-one".