1321011101 has 2 divisors, whose sum is σ = 1321011102. Its totient is φ = 1321011100.

The previous prime is 1321011079. The next prime is 1321011149. The reversal of 1321011101 is 1011101231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1283788900 + 37222201 = 35830^2 + 6101^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321011101 - 2²² = 1316816797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321010101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660505550 + 660505551.

It is an arithmetic number, because the mean of its divisors is an integer number (660505551).

Almost surely, 2^1321011101 is an apocalyptic number.

It is an amenable number.

1321011101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321011101 is an equidigital number, since it uses as much as digits as its factorization.

1321011101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1321011101 is about 36345.7164051006. The cubic root of 1321011101 is about 1097.2413245279.

Adding to 1321011101 its reverse (1011101231), we get a palindrome (2332112332).

The spelling of 1321011101 in words is "one billion, three hundred twenty-one million, eleven thousand, one hundred one".