221020021201873 has 2 divisors, whose sum is σ = 221020021201874. Its totient is φ = 221020021201872.

The previous prime is 221020021201823. The next prime is 221020021201877. The reversal of 221020021201873 is 378102120020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120723661954624 + 100296359247249 = 10987432^2 + 10014807^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020021201873 - 2¹³ = 221020021193681 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020021201877) 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, 110510010600936 + 110510010600937.

It is an arithmetic number, because the mean of its divisors is an integer number (110510010600937).

Almost surely, 2^{221020021201873} is an apocalyptic number.

It is an amenable number.

221020021201873 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020021201873 is an equidigital number, since it uses as much as digits as its factorization.

221020021201873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 221020021201873 its reverse (378102120020122), we get a palindrome (599122141221995).

The spelling of 221020021201873 in words is "two hundred twenty-one trillion, twenty billion, twenty-one million, two hundred one thousand, eight hundred seventy-three".