21238506326 has 4 divisors (see below), whose sum is σ = 31857759492. Its totient is φ = 10619253162.

The previous prime is 21238506253. The next prime is 21238506349. The reversal of 21238506326 is 62360583212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21238506326.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5309626580 + ... + 5309626583.

It is an arithmetic number, because the mean of its divisors is an integer number (7964439873).

Almost surely, 2^21238506326 is an apocalyptic number.

21238506326 is a deficient number, since it is larger than the sum of its proper divisors (10619253166).

21238506326 is a wasteful number, since it uses less digits than its factorization.

21238506326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10619253165.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21238506326 in words is "twenty-one billion, two hundred thirty-eight million, five hundred six thousand, three hundred twenty-six".