20111211101221 has 8 divisors (see below), whose sum is σ = 20333508986880. Its totient is φ = 19889912307888.

The previous prime is 20111211101183. The next prime is 20111211101263. The reversal of 20111211101221 is 12210111211102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20111211101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111211101195 and 20111211101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111211101321) 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, 249732601 + ... + 249813118.

It is an arithmetic number, because the mean of its divisors is an integer number (2541688623360).

Almost surely, 2^{20111211101221} is an apocalyptic number.

It is an amenable number.

20111211101221 is a deficient number, since it is larger than the sum of its proper divisors (222297885659).

20111211101221 is a wasteful number, since it uses less digits than its factorization.

20111211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499546163.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20111211101221 its reverse (12210111211102), we get a palindrome (32321322312323).

The spelling of 20111211101221 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".