21201122120273 has 2 divisors, whose sum is σ = 21201122120274. Its totient is φ = 21201122120272.

The previous prime is 21201122120107. The next prime is 21201122120287. The reversal of 21201122120273 is 37202122110212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17248214691409 + 3952907428864 = 4153097^2 + 1988192^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201122120273 - 2¹⁸ = 21201121858129 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201122122273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600561060136 + 10600561060137.

It is an arithmetic number, because the mean of its divisors is an integer number (10600561060137).

Almost surely, 2^{21201122120273} is an apocalyptic number.

It is an amenable number.

21201122120273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201122120273 is an equidigital number, since it uses as much as digits as its factorization.

21201122120273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21201122120273 its reverse (37202122110212), we get a palindrome (58403244230485).

The spelling of 21201122120273 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred seventy-three".