20211099999 has 4 divisors (see below), whose sum is σ = 26948133336. Its totient is φ = 13474066664.

The previous prime is 20211099991. The next prime is 20211100009. The reversal of 20211099999 is 99999011202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20211099999 - 2³ = 20211099991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211099991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368516664 + ... + 3368516669.

It is an arithmetic number, because the mean of its divisors is an integer number (6737033334).

Almost surely, 2^20211099999 is an apocalyptic number.

20211099999 is a deficient number, since it is larger than the sum of its proper divisors (6737033337).

20211099999 is an equidigital number, since it uses as much as digits as its factorization.

20211099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737033336.

The product of its (nonzero) digits is 236196, while the sum is 51.

The spelling of 20211099999 in words is "twenty billion, two hundred eleven million, ninety-nine thousand, nine hundred ninety-nine".