23130211021 has 4 divisors (see below), whose sum is σ = 23130519100. Its totient is φ = 23129902944.

The previous prime is 23130210989. The next prime is 23130211037. The reversal of 23130211021 is 12011203132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3096922500 + 20033288521 = 55650^2 + 141539^2 .

It is a cyclic number.

It is not a de Polignac number, because 23130211021 - 2⁵ = 23130210989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23130210986 and 23130211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23130214021) 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, 40345 + ... + 218833.

It is an arithmetic number, because the mean of its divisors is an integer number (5782629775).

Almost surely, 2^23130211021 is an apocalyptic number.

It is an amenable number.

23130211021 is a deficient number, since it is larger than the sum of its proper divisors (308079).

23130211021 is a wasteful number, since it uses less digits than its factorization.

23130211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308078.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 23130211021 its reverse (12011203132), we get a palindrome (35141414153).

The spelling of 23130211021 in words is "twenty-three billion, one hundred thirty million, two hundred eleven thousand, twenty-one".