21112020112209 has 16 divisors (see below), whose sum is σ = 30314885446272. Its totient is φ = 12991930990848.

The previous prime is 21112020112147. The next prime is 21112020112241. The reversal of 21112020112209 is 90221102021112.

It is not a de Polignac number, because 21112020112209 - 2¹⁵ = 21112020079441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112020112709) 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, 4938604 + ... + 8161730.

It is an arithmetic number, because the mean of its divisors is an integer number (1894680340392).

Almost surely, 2^{21112020112209} is an apocalyptic number.

It is an amenable number.

21112020112209 is a deficient number, since it is larger than the sum of its proper divisors (9202865334063).

21112020112209 is a wasteful number, since it uses less digits than its factorization.

21112020112209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391096.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21112020112209 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred twelve thousand, two hundred nine".