221123311203121 has 2 divisors, whose sum is σ = 221123311203122. Its totient is φ = 221123311203120.

The previous prime is 221123311203103. The next prime is 221123311203173. The reversal of 221123311203121 is 121302113321122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209612484000000 + 11510827203121 = 14478000^2 + 3392761^2 .

It is a cyclic number.

It is not a de Polignac number, because 221123311203121 - 2³¹ = 221121163719473 is a prime.

It is not a weakly prime, because it can be changed into another prime (221123311203181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561655601560 + 110561655601561.

It is an arithmetic number, because the mean of its divisors is an integer number (110561655601561).

Almost surely, 2^{221123311203121} is an apocalyptic number.

It is an amenable number.

221123311203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123311203121 is an equidigital number, since it uses as much as digits as its factorization.

221123311203121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 221123311203121 its reverse (121302113321122), we get a palindrome (342425424524243).

The spelling of 221123311203121 in words is "two hundred twenty-one trillion, one hundred twenty-three billion, three hundred eleven million, two hundred three thousand, one hundred twenty-one".