21013202231 has 4 divisors (see below), whose sum is σ = 24015088272. Its totient is φ = 18011316192.

The previous prime is 21013202167. The next prime is 21013202233. The reversal of 21013202231 is 13220231012.

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 21013202231 - 2⁶ = 21013202167 is a prime.

It is a super-2 number, since 2×21013202231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013202233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500943010 + ... + 1500943023.

It is an arithmetic number, because the mean of its divisors is an integer number (6003772068).

Almost surely, 2^21013202231 is an apocalyptic number.

21013202231 is a deficient number, since it is larger than the sum of its proper divisors (3001886041).

21013202231 is an equidigital number, since it uses as much as digits as its factorization.

21013202231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001886040.

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

Adding to 21013202231 its reverse (13220231012), we get a palindrome (34233433243).

The spelling of 21013202231 in words is "twenty-one billion, thirteen million, two hundred two thousand, two hundred thirty-one".