20209210999 has 2 divisors, whose sum is σ = 20209211000. Its totient is φ = 20209210998.

The previous prime is 20209210991. The next prime is 20209211003. The reversal of 20209210999 is 99901290202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20209210999 - 2³ = 20209210991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20209210991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104605499 + 10104605500.

It is an arithmetic number, because the mean of its divisors is an integer number (10104605500).

Almost surely, 2^20209210999 is an apocalyptic number.

20209210999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209210999 is an equidigital number, since it uses as much as digits as its factorization.

20209210999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 20209210999 in words is "twenty billion, two hundred nine million, two hundred ten thousand, nine hundred ninety-nine".