21102230231 has 4 divisors (see below), whose sum is σ = 21391301952. Its totient is φ = 20813158512.

The previous prime is 21102230209. The next prime is 21102230257. The reversal of 21102230231 is 13203220112.

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 21102230231 - 2¹⁸ = 21101968087 is a prime.

It is a super-2 number, since 2×21102230231² (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 (21102230731) 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, 144535751 + ... + 144535896.

It is an arithmetic number, because the mean of its divisors is an integer number (5347825488).

Almost surely, 2^21102230231 is an apocalyptic number.

21102230231 is a deficient number, since it is larger than the sum of its proper divisors (289071721).

21102230231 is an equidigital number, since it uses as much as digits as its factorization.

21102230231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289071720.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21102230231 its reverse (13203220112), we get a palindrome (34305450343).

The spelling of 21102230231 in words is "twenty-one billion, one hundred two million, two hundred thirty thousand, two hundred thirty-one".