1321222020101 has 2 divisors, whose sum is σ = 1321222020102. Its totient is φ = 1321222020100.

The previous prime is 1321222020091. The next prime is 1321222020127. The reversal of 1321222020101 is 1010202221231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1289873547076 + 31348473025 = 1135726^2 + 177055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321222020101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321222020101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321222070101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660611010050 + 660611010051.

It is an arithmetic number, because the mean of its divisors is an integer number (660611010051).

Almost surely, 2^{1321222020101} is an apocalyptic number.

It is an amenable number.

1321222020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321222020101 is an equidigital number, since it uses as much as digits as its factorization.

1321222020101 is an evil number, because the sum of its binary digits is even.

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

Adding to 1321222020101 its reverse (1010202221231), we get a palindrome (2331424241332).

The spelling of 1321222020101 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred one".