21321434043 has 72 divisors (see below), whose sum is σ = 38650951248. Its totient is φ = 11226273408.

The previous prime is 21321434023. The next prime is 21321434129. The reversal of 21321434043 is 34043412312.

21321434043 is a `hidden beast` number, since 213 + 2 + 1 + 43 + 404 + 3 = 666.

It is not a de Polignac number, because 21321434043 - 2⁵ = 21321434011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321433998 and 21321434016.

It is not an unprimeable number, because it can be changed into a prime (21321434023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3511296 + ... + 3517362.

Almost surely, 2^21321434043 is an apocalyptic number.

21321434043 is a deficient number, since it is larger than the sum of its proper divisors (17329517205).

21321434043 is a wasteful number, since it uses less digits than its factorization.

21321434043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713 (or 6703 counting only the distinct ones).

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

Adding to 21321434043 its reverse (34043412312), we get a palindrome (55364846355).

The spelling of 21321434043 in words is "twenty-one billion, three hundred twenty-one million, four hundred thirty-four thousand, forty-three".