1321919101 has 2 divisors, whose sum is σ = 1321919102. Its totient is φ = 1321919100.

The previous prime is 1321919083. The next prime is 1321919107. The reversal of 1321919101 is 1019191231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314135001 + 7784100 = 36251^2 + 2790^2 .

It is an emirp because it is prime and its reverse (1019191231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321919101 - 2⁵ = 1321919069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321919101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321919107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660959550 + 660959551.

It is an arithmetic number, because the mean of its divisors is an integer number (660959551).

Almost surely, 2^1321919101 is an apocalyptic number.

It is an amenable number.

1321919101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321919101 is an equidigital number, since it uses as much as digits as its factorization.

1321919101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 1321919101 is about 36358.2054150091. The cubic root of 1321919101 is about 1097.4926640613.

The spelling of 1321919101 in words is "one billion, three hundred twenty-one million, nine hundred nineteen thousand, one hundred one".