20110012211221 has 16 divisors (see below), whose sum is σ = 20402238795120. Its totient is φ = 19820431088640.

The previous prime is 20110012211197. The next prime is 20110012211273. The reversal of 20110012211221 is 12211221001102.

It can be written as a sum of positive squares in 8 ways, for example, as 12876542792100 + 7233469419121 = 3588390^2 + 2689511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110012211221 - 2¹⁵ = 20110012178453 is a prime.

It is a super-2 number, since 2×20110012211221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110012211195 and 20110012211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110012211021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10144605 + ... + 11963821.

It is an arithmetic number, because the mean of its divisors is an integer number (1275139924695).

Almost surely, 2^{20110012211221} is an apocalyptic number.

It is an amenable number.

20110012211221 is a deficient number, since it is larger than the sum of its proper divisors (292226583899).

20110012211221 is a wasteful number, since it uses less digits than its factorization.

20110012211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819944.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20110012211221 its reverse (12211221001102), we get a palindrome (32321233212323).

The spelling of 20110012211221 in words is "twenty trillion, one hundred ten billion, twelve million, two hundred eleven thousand, two hundred twenty-one".