2011212112221 has 24 divisors (see below), whose sum is σ = 3136939781976. Its totient is φ = 1234350817920.

The previous prime is 2011212112213. The next prime is 2011212112223. The reversal of 2011212112221 is 1222112121102.

It can be written as a sum of positive squares in 4 ways, for example, as 30972128121 + 1980239984100 = 175989^2 + 1407210^2 .

It is not a de Polignac number, because 2011212112221 - 2³ = 2011212112213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2011212112194 and 2011212112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011212112223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22999050 + ... + 23086331.

It is an arithmetic number, because the mean of its divisors is an integer number (130705824249).

Almost surely, 2^{2011212112221} is an apocalyptic number.

It is an amenable number.

2011212112221 is a deficient number, since it is larger than the sum of its proper divisors (1125727669755).

2011212112221 is a wasteful number, since it uses less digits than its factorization.

2011212112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46085773 (or 46085770 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2011212112221 its reverse (1222112121102), we get a palindrome (3233324233323).

The spelling of 2011212112221 in words is "two trillion, eleven billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".