20020212521 has 2 divisors, whose sum is σ = 20020212522. Its totient is φ = 20020212520.

The previous prime is 20020212497. The next prime is 20020212557. The reversal of 20020212521 is 12521202002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18036490000 + 1983722521 = 134300^2 + 44539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020212521 - 2¹⁴ = 20020196137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20020212521.

It is not a weakly prime, because it can be changed into another prime (20020212221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010106260 + 10010106261.

It is an arithmetic number, because the mean of its divisors is an integer number (10010106261).

Almost surely, 2^20020212521 is an apocalyptic number.

It is an amenable number.

20020212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020212521 is an equidigital number, since it uses as much as digits as its factorization.

20020212521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 20020212521 its reverse (12521202002), we get a palindrome (32541414523).

The spelling of 20020212521 in words is "twenty billion, twenty million, two hundred twelve thousand, five hundred twenty-one".