20020011000021 has 12 divisors (see below), whose sum is σ = 28929264462540. Its totient is φ = 13341379786560.

The previous prime is 20020011000019. The next prime is 20020011000037. The reversal of 20020011000021 is 12000011002002.

It can be written as a sum of positive squares in 2 ways, for example, as 86018437521 + 19933992562500 = 293289^2 + 4464750^2 .

It is not a de Polignac number, because 20020011000021 - 2¹ = 20020011000019 is a prime.

It is a super-3 number, since 3×20020011000021³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20020010999967 and 20020011000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020011000221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 441160506 + ... + 441205883.

It is an arithmetic number, because the mean of its divisors is an integer number (2410772038545).

Almost surely, 2^{20020011000021} is an apocalyptic number.

It is an amenable number.

20020011000021 is a deficient number, since it is larger than the sum of its proper divisors (8909253462519).

20020011000021 is a wasteful number, since it uses less digits than its factorization.

20020011000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882368916 (or 882368913 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20020011000021 its reverse (12000011002002), we get a palindrome (32020022002023).

The spelling of 20020011000021 in words is "twenty trillion, twenty billion, eleven million, twenty-one", and thus it is an aban number and an uban number.