21022201201121 has 2 divisors, whose sum is σ = 21022201201122. Its totient is φ = 21022201201120.

The previous prime is 21022201201081. The next prime is 21022201201129. The reversal of 21022201201121 is 12110210222012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12884366670400 + 8137834530721 = 3589480^2 + 2852689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022201201121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21022201201121.

It is not a weakly prime, because it can be changed into another prime (21022201201129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511100600560 + 10511100600561.

It is an arithmetic number, because the mean of its divisors is an integer number (10511100600561).

Almost surely, 2^{21022201201121} is an apocalyptic number.

It is an amenable number.

21022201201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022201201121 is an equidigital number, since it uses as much as digits as its factorization.

21022201201121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21022201201121 its reverse (12110210222012), we get a palindrome (33132411423133).

The spelling of 21022201201121 in words is "twenty-one trillion, twenty-two billion, two hundred one million, two hundred one thousand, one hundred twenty-one".