21106513238 has 8 divisors (see below), whose sum is σ = 31695627288. Its totient is φ = 10541304144.

The previous prime is 21106513237. The next prime is 21106513271. The reversal of 21106513238 is 83231560112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106513237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5974031 + ... + 5977562.

It is an arithmetic number, because the mean of its divisors is an integer number (3961953411).

Almost surely, 2^21106513238 is an apocalyptic number.

21106513238 is a deficient number, since it is larger than the sum of its proper divisors (10589114050).

21106513238 is a wasteful number, since it uses less digits than its factorization.

21106513238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11952478.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21106513238 in words is "twenty-one billion, one hundred six million, five hundred thirteen thousand, two hundred thirty-eight".