21232240234 has 4 divisors (see below), whose sum is σ = 31848360354. Its totient is φ = 10616120116.

The previous prime is 21232240231. The next prime is 21232240273. The reversal of 21232240234 is 43204223212.

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., 16166359609 + 5065880625 = 127147^2 + 71175^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21232240199 and 21232240208.

It is not an unprimeable number, because it can be changed into a prime (21232240231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308060057 + ... + 5308060060.

Almost surely, 2^21232240234 is an apocalyptic number.

21232240234 is a deficient number, since it is larger than the sum of its proper divisors (10616120120).

21232240234 is a wasteful number, since it uses less digits than its factorization.

21232240234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10616120119.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21232240234 its reverse (43204223212), we get a palindrome (64436463446).

The spelling of 21232240234 in words is "twenty-one billion, two hundred thirty-two million, two hundred forty thousand, two hundred thirty-four".