20101111210221 has 8 divisors (see below), whose sum is σ = 27140740874880. Its totient is φ = 13231111176192.

The previous prime is 20101111210217. The next prime is 20101111210247. The reversal of 20101111210221 is 12201211110102.

It is a happy number.

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

It is not a de Polignac number, because 20101111210221 - 2² = 20101111210217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20101111210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101111210021) 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, 42407407380 + ... + 42407407853.

It is an arithmetic number, because the mean of its divisors is an integer number (3392592609360).

Almost surely, 2^{20101111210221} is an apocalyptic number.

It is an amenable number.

20101111210221 is a deficient number, since it is larger than the sum of its proper divisors (7039629664659).

20101111210221 is an equidigital number, since it uses as much as digits as its factorization.

20101111210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84814815315.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20101111210221 its reverse (12201211110102), we get a palindrome (32302322320323).

The spelling of 20101111210221 in words is "twenty trillion, one hundred one billion, one hundred eleven million, two hundred ten thousand, two hundred twenty-one".