220200122012821 has 2 divisors, whose sum is σ = 220200122012822. Its totient is φ = 220200122012820.

The previous prime is 220200122012797. The next prime is 220200122012839. The reversal of 220200122012821 is 128210221002022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216927239402500 + 3272882610321 = 14728450^2 + 1809111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220200122012821 is a prime.

It is a super-2 number, since 2×220200122012821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220200122012851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110100061006410 + 110100061006411.

It is an arithmetic number, because the mean of its divisors is an integer number (110100061006411).

Almost surely, 2^{220200122012821} is an apocalyptic number.

It is an amenable number.

220200122012821 is a deficient number, since it is larger than the sum of its proper divisors (1).

220200122012821 is an equidigital number, since it uses as much as digits as its factorization.

220200122012821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 220200122012821 its reverse (128210221002022), we get a palindrome (348410343014843).

The spelling of 220200122012821 in words is "two hundred twenty trillion, two hundred billion, one hundred twenty-two million, twelve thousand, eight hundred twenty-one".