21101310211209 has 32 divisors (see below), whose sum is σ = 28943738449920. Its totient is φ = 13667609644800.

The previous prime is 21101310211199. The next prime is 21101310211211. The reversal of 21101310211209 is 90211201310112.

It is not a de Polignac number, because 21101310211209 - 2¹² = 21101310207113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21101310211259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184781089 + ... + 184895249.

It is an arithmetic number, because the mean of its divisors is an integer number (904491826560).

Almost surely, 2^{21101310211209} is an apocalyptic number.

It is an amenable number.

21101310211209 is a deficient number, since it is larger than the sum of its proper divisors (7842428238711).

21101310211209 is a wasteful number, since it uses less digits than its factorization.

21101310211209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123781.

The product of its (nonzero) digits is 216, while the sum is 24.

The spelling of 21101310211209 in words is "twenty-one trillion, one hundred one billion, three hundred ten million, two hundred eleven thousand, two hundred nine".