21112221209999 has 16 divisors (see below), whose sum is σ = 21939378155520. Its totient is φ = 20291684323680.

The previous prime is 21112221209983. The next prime is 21112221210007. The reversal of 21112221209999 is 99990212221112.

It is a cyclic number.

It is not a de Polignac number, because 21112221209999 - 2⁴ = 21112221209983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112221209899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132047384 + ... + 132207170.

It is an arithmetic number, because the mean of its divisors is an integer number (1371211134720).

Almost surely, 2^{21112221209999} is an apocalyptic number.

21112221209999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21112221209999 is a deficient number, since it is larger than the sum of its proper divisors (827156945521).

21112221209999 is a wasteful number, since it uses less digits than its factorization.

21112221209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180470.

The product of its (nonzero) digits is 209952, while the sum is 50.

The spelling of 21112221209999 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two hundred nine thousand, nine hundred ninety-nine".