20553016021 has 2 divisors, whose sum is σ = 20553016022. Its totient is φ = 20553016020.

The previous prime is 20553016013. The next prime is 20553016061. The reversal of 20553016021 is 12061035502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19201644900 + 1351371121 = 138570^2 + 36761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553016021 - 2³ = 20553016013 is a prime.

It is a super-3 number, since 3×20553016021³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553016061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276508010 + 10276508011.

It is an arithmetic number, because the mean of its divisors is an integer number (10276508011).

Almost surely, 2^20553016021 is an apocalyptic number.

It is an amenable number.

20553016021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553016021 is an equidigital number, since it uses as much as digits as its factorization.

20553016021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 20553016021 in words is "twenty billion, five hundred fifty-three million, sixteen thousand, twenty-one".