21112221099 has 8 divisors (see below), whose sum is σ = 28297009152. Its totient is φ = 14001123560.

The previous prime is 21112221043. The next prime is 21112221101. The reversal of 21112221099 is 99012221112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112221099 - 2⁷ = 21112220971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112221199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18421959 + ... + 18423104.

It is an arithmetic number, because the mean of its divisors is an integer number (3537126144).

Almost surely, 2^21112221099 is an apocalyptic number.

21112221099 is a deficient number, since it is larger than the sum of its proper divisors (7184788053).

21112221099 is a wasteful number, since it uses less digits than its factorization.

21112221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36845257.

The product of its (nonzero) digits is 1296, while the sum is 30.

It can be divided in two parts, 211122 and 21099, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21112221099 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, ninety-nine".