20131020021 has 16 divisors (see below), whose sum is σ = 30847219200. Its totient is φ = 11439172848.

The previous prime is 20131020001. The next prime is 20131020031. The reversal of 20131020021 is 12002013102.

It is not a de Polignac number, because 20131020021 - 2⁶ = 20131019957 is a prime.

It is a super-3 number, since 3×20131020021³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20131019979 and 20131020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131020001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2673951 + ... + 2681468.

It is an arithmetic number, because the mean of its divisors is an integer number (1927951200).

Almost surely, 2^20131020021 is an apocalyptic number.

20131020021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20131020021 is a deficient number, since it is larger than the sum of its proper divisors (10716199179).

20131020021 is a wasteful number, since it uses less digits than its factorization.

20131020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355608.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20131020021 its reverse (12002013102), we get a palindrome (32133033123).

The spelling of 20131020021 in words is "twenty billion, one hundred thirty-one million, twenty thousand, twenty-one".