20192921101 has 2 divisors, whose sum is σ = 20192921102. Its totient is φ = 20192921100.

The previous prime is 20192921087. The next prime is 20192921107. The reversal of 20192921101 is 10112929102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18292833001 + 1900088100 = 135251^2 + 43590^2 .

It is a cyclic number.

It is not a de Polignac number, because 20192921101 - 2³³ = 11602986509 is a prime.

It is a super-2 number, since 2×20192921101² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20192921101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20192921107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096460550 + 10096460551.

It is an arithmetic number, because the mean of its divisors is an integer number (10096460551).

Almost surely, 2^20192921101 is an apocalyptic number.

It is an amenable number.

20192921101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20192921101 is an equidigital number, since it uses as much as digits as its factorization.

20192921101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 20192921101 in words is "twenty billion, one hundred ninety-two million, nine hundred twenty-one thousand, one hundred one".