21112012201209 has 32 divisors (see below), whose sum is σ = 29491155544320. Its totient is φ = 13419685124352.

The previous prime is 21112012201183. The next prime is 21112012201253. The reversal of 21112012201209 is 90210221021112.

It is not a de Polignac number, because 21112012201209 - 2¹³ = 21112012193017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112012201109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2712564 + ... + 7041450.

It is an arithmetic number, because the mean of its divisors is an integer number (921598610760).

Almost surely, 2^{21112012201209} is an apocalyptic number.

It is an amenable number.

21112012201209 is a deficient number, since it is larger than the sum of its proper divisors (8379143343111).

21112012201209 is a wasteful number, since it uses less digits than its factorization.

21112012201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329809.

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

The spelling of 21112012201209 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred one thousand, two hundred nine".