20111223221 has 8 divisors (see below), whose sum is σ = 20206181400. Its totient is φ = 20016488448.

The previous prime is 20111223217. The next prime is 20111223233. The reversal of 20111223221 is 12232211102.

It can be written as a sum of positive squares in 4 ways, for example, as 14268302500 + 5842920721 = 119450^2 + 76439^2 .

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 20111223221 - 2² = 20111223217 is a prime.

It is a super-2 number, since 2×20111223221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111223211) 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, 126005 + ... + 236853.

It is an arithmetic number, because the mean of its divisors is an integer number (2525772675).

Almost surely, 2^20111223221 is an apocalyptic number.

It is an amenable number.

20111223221 is a deficient number, since it is larger than the sum of its proper divisors (94958179).

20111223221 is a wasteful number, since it uses less digits than its factorization.

20111223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111703.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20111223221 its reverse (12232211102), we get a palindrome (32343434323).

The spelling of 20111223221 in words is "twenty billion, one hundred eleven million, two hundred twenty-three thousand, two hundred twenty-one".