20303131021 has 8 divisors (see below), whose sum is σ = 21274525440. Its totient is φ = 19339124112.

The previous prime is 20303131007. The next prime is 20303131073. The reversal of 20303131021 is 12013130302.

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

It is a cyclic number.

It is not a de Polignac number, because 20303131021 - 2¹⁹ = 20302606733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303130986 and 20303131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303131001) 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, 1841250 + ... + 1852243.

It is an arithmetic number, because the mean of its divisors is an integer number (2659315680).

Almost surely, 2^20303131021 is an apocalyptic number.

It is an amenable number.

20303131021 is a deficient number, since it is larger than the sum of its proper divisors (971394419).

20303131021 is a wasteful number, since it uses less digits than its factorization.

20303131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3693755.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20303131021 its reverse (12013130302), we get a palindrome (32316261323).

The spelling of 20303131021 in words is "twenty billion, three hundred three million, one hundred thirty-one thousand, twenty-one".