2012112212221 has 4 divisors (see below), whose sum is σ = 2015686124352. Its totient is φ = 2008538300092.

The previous prime is 2012112212177. The next prime is 2012112212381. The reversal of 2012112212221 is 1222122112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2012112212221 - 2⁷ = 2012112212093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012112212821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786955221 + ... + 1786956346.

It is an arithmetic number, because the mean of its divisors is an integer number (503921531088).

Almost surely, 2^{2012112212221} is an apocalyptic number.

It is an amenable number.

2012112212221 is a deficient number, since it is larger than the sum of its proper divisors (3573912131).

2012112212221 is an equidigital number, since it uses as much as digits as its factorization.

2012112212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573912130.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2012112212221 its reverse (1222122112102), we get a palindrome (3234234324323).

The spelling of 2012112212221 in words is "two trillion, twelve billion, one hundred twelve million, two hundred twelve thousand, two hundred twenty-one".