21330502234 has 4 divisors (see below), whose sum is σ = 31995753354. Its totient is φ = 10665251116.

The previous prime is 21330502187. The next prime is 21330502267. The reversal of 21330502234 is 43220503312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20507099209 + 823403025 = 143203^2 + 28695^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21330502199 and 21330502208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332625557 + ... + 5332625560.

Almost surely, 2^21330502234 is an apocalyptic number.

21330502234 is a deficient number, since it is larger than the sum of its proper divisors (10665251120).

21330502234 is a wasteful number, since it uses less digits than its factorization.

21330502234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10665251119.

The product of its (nonzero) digits is 4320, while the sum is 25.

The spelling of 21330502234 in words is "twenty-one billion, three hundred thirty million, five hundred two thousand, two hundred thirty-four".