21431442033 has 12 divisors (see below), whose sum is σ = 30959969040. Its totient is φ = 14286039576.

The previous prime is 21431442001. The next prime is 21431442049. The reversal of 21431442033 is 33024413412.

21431442033 is a `hidden beast` number, since 21 + 431 + 4 + 4 + 203 + 3 = 666.

It is not a de Polignac number, because 21431442033 - 2⁵ = 21431442001 is a prime.

It is a super-2 number, since 2×21431442033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21431441988 and 21431442006.

It is not an unprimeable number, because it can be changed into a prime (21431442733) 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, 43803 + ... + 211616.

It is an arithmetic number, because the mean of its divisors is an integer number (2579997420).

Almost surely, 2^21431442033 is an apocalyptic number.

It is an amenable number.

21431442033 is a deficient number, since it is larger than the sum of its proper divisors (9528527007).

21431442033 is a wasteful number, since it uses less digits than its factorization.

21431442033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264748 (or 264745 counting only the distinct ones).

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

Adding to 21431442033 its reverse (33024413412), we get a palindrome (54455855445).

The spelling of 21431442033 in words is "twenty-one billion, four hundred thirty-one million, four hundred forty-two thousand, thirty-three".