21214421433 has 12 divisors (see below), whose sum is σ = 31390445268. Its totient is φ = 13797997440.

The previous prime is 21214421419. The next prime is 21214421441. The reversal of 21214421433 is 33412441212.

21214421433 is a `hidden beast` number, since 21 + 214 + 421 + 4 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7522613289 + 13691808144 = 86733^2 + 117012^2 .

It is not a de Polignac number, because 21214421433 - 2⁵ = 21214421401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21214421397 and 21214421406.

It is not an unprimeable number, because it can be changed into a prime (21214421453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28745460 + ... + 28746197.

It is an arithmetic number, because the mean of its divisors is an integer number (2615870439).

Almost surely, 2^21214421433 is an apocalyptic number.

It is an amenable number.

21214421433 is a deficient number, since it is larger than the sum of its proper divisors (10176023835).

21214421433 is a wasteful number, since it uses less digits than its factorization.

21214421433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57491704 (or 57491701 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21214421433 its reverse (33412441212), we get a palindrome (54626862645).

The spelling of 21214421433 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty-one thousand, four hundred thirty-three".