20100111221 has 8 divisors (see below), whose sum is σ = 20588229024. Its totient is φ = 19612933200.

The previous prime is 20100111203. The next prime is 20100111253. The reversal of 20100111221 is 12211100102.

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

It is a cyclic number.

It is not a de Polignac number, because 20100111221 - 2²² = 20095916917 is a prime.

It is a super-2 number, since 2×20100111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100111271) 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, 191555 + ... + 277296.

It is an arithmetic number, because the mean of its divisors is an integer number (2573528628).

Almost surely, 2^20100111221 is an apocalyptic number.

It is an amenable number.

20100111221 is a deficient number, since it is larger than the sum of its proper divisors (488117803).

20100111221 is an equidigital number, since it uses as much as digits as its factorization.

20100111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469891.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20100111221 its reverse (12211100102), we get a palindrome (32311211323).

The spelling of 20100111221 in words is "twenty billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".