20131021021 has 8 divisors (see below), whose sum is σ = 20226024000. Its totient is φ = 20036136000.

The previous prime is 20131020989. The next prime is 20131021049. The reversal of 20131021021 is 12012013102.

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 20131021021 - 2⁵ = 20131020989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131020992 and 20131021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131021061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322485 + ... + 379813.

It is an arithmetic number, because the mean of its divisors is an integer number (2528253000).

Almost surely, 2^20131021021 is an apocalyptic number.

It is an amenable number.

20131021021 is a deficient number, since it is larger than the sum of its proper divisors (95002979).

20131021021 is a wasteful number, since it uses less digits than its factorization.

20131021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58979.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20131021021 its reverse (12012013102), we get a palindrome (32143034123).

The spelling of 20131021021 in words is "twenty billion, one hundred thirty-one million, twenty-one thousand, twenty-one".