20010013021 has 16 divisors (see below), whose sum is σ = 21530995200. Its totient is φ = 18553953600.

The previous prime is 20010013003. The next prime is 20010013033. The reversal of 20010013021 is 12031001002.

It is a cyclic number.

It is not a de Polignac number, because 20010013021 - 2⁵ = 20010012989 is a prime.

It is a super-2 number, since 2×20010013021² (a number of 21 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 = 20010012989 and 20010013007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20070013021) 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, 32815 + ... + 202723.

It is an arithmetic number, because the mean of its divisors is an integer number (1345687200).

Almost surely, 2^20010013021 is an apocalyptic number.

It is an amenable number.

20010013021 is a deficient number, since it is larger than the sum of its proper divisors (1520982179).

20010013021 is a wasteful number, since it uses less digits than its factorization.

20010013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170100.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20010013021 its reverse (12031001002), we get a palindrome (32041014023).

The spelling of 20010013021 in words is "twenty billion, ten million, thirteen thousand, twenty-one".