20101099 has 2 divisors, whose sum is σ = 20101100. Its totient is φ = 20101098.

The previous prime is 20101097. The next prime is 20101129. The reversal of 20101099 is 99010102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20101099 - 2¹ = 20101097 is a prime.

Together with 20101097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20101091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050549 + 10050550.

It is an arithmetic number, because the mean of its divisors is an integer number (10050550).

Almost surely, 2^20101099 is an apocalyptic number.

20101099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101099 is an equidigital number, since it uses as much as digits as its factorization.

20101099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 20101099 is about 4483.4249185193. The cubic root of 20101099 is about 271.8983679919.

The spelling of 20101099 in words is "twenty million, one hundred one thousand, ninety-nine".