20101321091 has 2 divisors, whose sum is σ = 20101321092. Its totient is φ = 20101321090.

The previous prime is 20101320977. The next prime is 20101321117. The reversal of 20101321091 is 19012310102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20101321091 - 2¹⁸ = 20101058947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20101321991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050660545 + 10050660546.

It is an arithmetic number, because the mean of its divisors is an integer number (10050660546).

Almost surely, 2^20101321091 is an apocalyptic number.

20101321091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101321091 is an equidigital number, since it uses as much as digits as its factorization.

20101321091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20101321091 its reverse (19012310102), we get a palindrome (39113631193).

The spelling of 20101321091 in words is "twenty billion, one hundred one million, three hundred twenty-one thousand, ninety-one".