20020011021 has 24 divisors (see below), whose sum is σ = 29505467160. Its totient is φ = 13076159616.

The previous prime is 20020010963. The next prime is 20020011043. The reversal of 20020011021 is 12011002002.

It can be written as a sum of positive squares in 4 ways, for example, as 1161855396 + 18858155625 = 34086^2 + 137325^2 .

It is not a de Polignac number, because 20020011021 - 2²³ = 20011622413 is a prime.

It is a super-2 number, since 2×20020011021² (a number of 21 digits) contains 22 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 = 20020010994 and 20020011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020011821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308595 + ... + 367791.

It is an arithmetic number, because the mean of its divisors is an integer number (1229394465).

Almost surely, 2^20020011021 is an apocalyptic number.

It is an amenable number.

20020011021 is a deficient number, since it is larger than the sum of its proper divisors (9485456139).

20020011021 is a wasteful number, since it uses less digits than its factorization.

20020011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59965 (or 59962 counting only the distinct ones).

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

Adding to 20020011021 its reverse (12011002002), we get a palindrome (32031013023).

The spelling of 20020011021 in words is "twenty billion, twenty million, eleven thousand, twenty-one".