20101399 has 2 divisors, whose sum is σ = 20101400. Its totient is φ = 20101398.

The previous prime is 20101387. The next prime is 20101421. The reversal of 20101399 is 99310102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20101399 - 2¹³ = 20093207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050699 + 10050700.

It is an arithmetic number, because the mean of its divisors is an integer number (10050700).

Almost surely, 2^20101399 is an apocalyptic number.

20101399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101399 is an equidigital number, since it uses as much as digits as its factorization.

20101399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 20101399 is about 4483.4583749601. The cubic root of 20101399 is about 271.8997206394.

The spelling of 20101399 in words is "twenty million, one hundred one thousand, three hundred ninety-nine".