20110000212821 has 2 divisors, whose sum is σ = 20110000212822. Its totient is φ = 20110000212820.

The previous prime is 20110000212811. The next prime is 20110000212859. The reversal of 20110000212821 is 12821200001102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19819511551921 + 290488660900 = 4451911^2 + 538970^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110000212821 - 2²⁶ = 20109933103957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110000212793 and 20110000212802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110000212811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055000106410 + 10055000106411.

It is an arithmetic number, because the mean of its divisors is an integer number (10055000106411).

Almost surely, 2^{20110000212821} is an apocalyptic number.

It is an amenable number.

20110000212821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110000212821 is an equidigital number, since it uses as much as digits as its factorization.

20110000212821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20110000212821 its reverse (12821200001102), we get a palindrome (32931200213923).

The spelling of 20110000212821 in words is "twenty trillion, one hundred ten billion, two hundred twelve thousand, eight hundred twenty-one".