21231030111 has 8 divisors (see below), whose sum is σ = 28325531520. Its totient is φ = 14145274392.

The previous prime is 21231030101. The next prime is 21231030127. The reversal of 21231030111 is 11103013212.

It is a happy number.

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

It is not a de Polignac number, because 21231030111 - 2⁷ = 21231029983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231030101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2180755 + ... + 2190468.

It is an arithmetic number, because the mean of its divisors is an integer number (3540691440).

Almost surely, 2^21231030111 is an apocalyptic number.

21231030111 is a deficient number, since it is larger than the sum of its proper divisors (7094501409).

21231030111 is a wasteful number, since it uses less digits than its factorization.

21231030111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372845.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21231030111 its reverse (11103013212), we get a palindrome (32334043323).

It can be divided in two parts, 21 and 231030111, that added together give a palindrome (231030132).

The spelling of 21231030111 in words is "twenty-one billion, two hundred thirty-one million, thirty thousand, one hundred eleven".