21121201201201 has 2 divisors, whose sum is σ = 21121201201202. Its totient is φ = 21121201201200.

The previous prime is 21121201201127. The next prime is 21121201201259. The reversal of 21121201201201 is 10210210212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14019962216976 + 7101238984225 = 3744324^2 + 2664815^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121201201201 - 2¹⁵ = 21121201168433 is a prime.

It is a super-2 number, since 2×21121201201201² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121201201601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560600600600 + 10560600600601.

It is an arithmetic number, because the mean of its divisors is an integer number (10560600600601).

Almost surely, 2^{21121201201201} is an apocalyptic number.

It is an amenable number.

21121201201201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121201201201 is an equidigital number, since it uses as much as digits as its factorization.

21121201201201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121201201201 its reverse (10210210212112), we get a palindrome (31331411413313).

The spelling of 21121201201201 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, two hundred one thousand, two hundred one".