221201203121 has 2 divisors, whose sum is σ = 221201203122. Its totient is φ = 221201203120.

The previous prime is 221201203037. The next prime is 221201203133. The reversal of 221201203121 is 121302102122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120752775025 + 100448428096 = 347495^2 + 316936^2 .

It is a cyclic number.

It is not a de Polignac number, because 221201203121 - 2¹⁸ = 221200940977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221201203121.

It is not a weakly prime, because it can be changed into another prime (221201203151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600601560 + 110600601561.

It is an arithmetic number, because the mean of its divisors is an integer number (110600601561).

Almost surely, 2^221201203121 is an apocalyptic number.

It is an amenable number.

221201203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201203121 is an equidigital number, since it uses as much as digits as its factorization.

221201203121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221201203121 its reverse (121302102122), we get a palindrome (342503305243).

The spelling of 221201203121 in words is "two hundred twenty-one billion, two hundred one million, two hundred three thousand, one hundred twenty-one".