21020203313231 has 8 divisors (see below), whose sum is σ = 21509851676544. Its totient is φ = 20530591605720.

The previous prime is 21020203313201. The next prime is 21020203313237. The reversal of 21020203313231 is 13231330202012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020203313231 is a prime.

It is a super-2 number, since 2×21020203313231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020203313197 and 21020203313206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020203313237) 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, 8002001 + ... + 10299146.

It is an arithmetic number, because the mean of its divisors is an integer number (2688731459568).

Almost surely, 2^{21020203313231} is an apocalyptic number.

21020203313231 is a deficient number, since it is larger than the sum of its proper divisors (489648363313).

21020203313231 is a wasteful number, since it uses less digits than its factorization.

21020203313231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18327901.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21020203313231 its reverse (13231330202012), we get a palindrome (34251533515243).

The spelling of 21020203313231 in words is "twenty-one trillion, twenty billion, two hundred three million, three hundred thirteen thousand, two hundred thirty-one".