20020211021 has 2 divisors, whose sum is σ = 20020211022. Its totient is φ = 20020211020.

The previous prime is 20020211009. The next prime is 20020211051. The reversal of 20020211021 is 12011202002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19844356900 + 175854121 = 140870^2 + 13261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020211021 - 2¹⁴ = 20020194637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020210993 and 20020211011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020211051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010105510 + 10010105511.

It is an arithmetic number, because the mean of its divisors is an integer number (10010105511).

Almost surely, 2^20020211021 is an apocalyptic number.

It is an amenable number.

20020211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020211021 is an equidigital number, since it uses as much as digits as its factorization.

20020211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020211021 its reverse (12011202002), we get a palindrome (32031413023).

The spelling of 20020211021 in words is "twenty billion, twenty million, two hundred eleven thousand, twenty-one".