20020211621 has 2 divisors, whose sum is σ = 20020211622. Its totient is φ = 20020211620.

The previous prime is 20020211597. The next prime is 20020211647. The reversal of 20020211621 is 12611202002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19856755396 + 163456225 = 140914^2 + 12785^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020211621 - 2³⁴ = 2840342437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20020211621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010105810 + 10010105811.

It is an arithmetic number, because the mean of its divisors is an integer number (10010105811).

Almost surely, 2^20020211621 is an apocalyptic number.

It is an amenable number.

20020211621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020211621 is an equidigital number, since it uses as much as digits as its factorization.

20020211621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20020211621 its reverse (12611202002), we get a palindrome (32631413623).

The spelling of 20020211621 in words is "twenty billion, twenty million, two hundred eleven thousand, six hundred twenty-one".