21103310231 has 4 divisors (see below), whose sum is σ = 21114591264. Its totient is φ = 21092029200.

The previous prime is 21103310227. The next prime is 21103310299. The reversal of 21103310231 is 13201330112.

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

It is a cyclic number.

It is not a de Polignac number, because 21103310231 - 2² = 21103310227 is a prime.

It is a super-2 number, since 2×21103310231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103310131) 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, 5637710 + ... + 5641451.

It is an arithmetic number, because the mean of its divisors is an integer number (5278647816).

Almost surely, 2^21103310231 is an apocalyptic number.

21103310231 is a deficient number, since it is larger than the sum of its proper divisors (11281033).

21103310231 is a wasteful number, since it uses less digits than its factorization.

21103310231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11281032.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21103310231 its reverse (13201330112), we get a palindrome (34304640343).

The spelling of 21103310231 in words is "twenty-one billion, one hundred three million, three hundred ten thousand, two hundred thirty-one".