221121120020057 has 2 divisors, whose sum is σ = 221121120020058. Its totient is φ = 221121120020056.

The previous prime is 221121120019991. The next prime is 221121120020107. The reversal of 221121120020057 is 750020021121122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211227302062921 + 9893817957136 = 14533661^2 + 3145444^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121120020057 - 2²⁸ = 221120851584601 is a prime.

It is not a weakly prime, because it can be changed into another prime (221121120020657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560560010028 + 110560560010029.

It is an arithmetic number, because the mean of its divisors is an integer number (110560560010029).

Almost surely, 2^{221121120020057} is an apocalyptic number.

It is an amenable number.

221121120020057 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121120020057 is an equidigital number, since it uses as much as digits as its factorization.

221121120020057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 221121120020057 its reverse (750020021121122), we get a palindrome (971141141141179).

The spelling of 221121120020057 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, twenty thousand, fifty-seven".