21120101099 has 4 divisors (see below), whose sum is σ = 21127256136. Its totient is φ = 21112946064.

The previous prime is 21120101089. The next prime is 21120101117. The reversal of 21120101099 is 99010102112.

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 21120101099 - 2⁴ = 21120101083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120101089) 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, 3573089 + ... + 3578994.

It is an arithmetic number, because the mean of its divisors is an integer number (5281814034).

Almost surely, 2^21120101099 is an apocalyptic number.

21120101099 is a deficient number, since it is larger than the sum of its proper divisors (7155037).

21120101099 is an equidigital number, since it uses as much as digits as its factorization.

21120101099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155036.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 21120101099 in words is "twenty-one billion, one hundred twenty million, one hundred one thousand, ninety-nine".