21120220111273 has 2 divisors, whose sum is σ = 21120220111274. Its totient is φ = 21120220111272.

The previous prime is 21120220111189. The next prime is 21120220111279. The reversal of 21120220111273 is 37211102202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15586490808729 + 5533729302544 = 3947973^2 + 2352388^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120220111273 - 2³⁷ = 20982781157801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120220111279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110055636 + 10560110055637.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110055637).

Almost surely, 2^{21120220111273} is an apocalyptic number.

It is an amenable number.

21120220111273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120220111273 is an equidigital number, since it uses as much as digits as its factorization.

21120220111273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 21120220111273 its reverse (37211102202112), we get a palindrome (58331322313385).

The spelling of 21120220111273 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred eleven thousand, two hundred seventy-three".