20111222111221 has 8 divisors (see below), whose sum is σ = 20133695032704. Its totient is φ = 20088752653200.

The previous prime is 20111222111219. The next prime is 20111222111237. The reversal of 20111222111221 is 12211122211102.

It is a happy number.

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 20111222111221 - 2¹ = 20111222111219 is a prime.

It is a super-2 number, since 2×20111222111221² (a number of 27 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 (20111232111221) 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, 10842336 + ... + 12560998.

It is an arithmetic number, because the mean of its divisors is an integer number (2516711879088).

Almost surely, 2^{20111222111221} is an apocalyptic number.

It is an amenable number.

20111222111221 is a deficient number, since it is larger than the sum of its proper divisors (22472921483).

20111222111221 is a wasteful number, since it uses less digits than its factorization.

20111222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731731.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20111222111221 its reverse (12211122211102), we get a palindrome (32322344322323).

The spelling of 20111222111221 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".