20211099999999 has 4 divisors (see below), whose sum is σ = 26948133333336. Its totient is φ = 13474066666664.

The previous prime is 20211099999967. The next prime is 20211100000031. The reversal of 20211099999999 is 99999999011202.

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

It is an interprime number because it is at equal distance from previous prime (20211099999967) and next prime (20211100000031).

It is a cyclic number.

It is not a de Polignac number, because 20211099999999 - 2⁵ = 20211099999967 is a prime.

20211099999999 is a modest number, since divided by 9999999 gives 2021109 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211099199999) 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, 3368516666664 + ... + 3368516666669.

It is an arithmetic number, because the mean of its divisors is an integer number (6737033333334).

Almost surely, 2^{20211099999999} is an apocalyptic number.

20211099999999 is a deficient number, since it is larger than the sum of its proper divisors (6737033333337).

20211099999999 is an equidigital number, since it uses as much as digits as its factorization.

20211099999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737033333336.

The product of its (nonzero) digits is 172186884, while the sum is 78.

The spelling of 20211099999999 in words is "twenty trillion, two hundred eleven billion, ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".