2012123320221 has 16 divisors (see below), whose sum is σ = 3128666000000. Its totient is φ = 1149784753824.

The previous prime is 2012123320159. The next prime is 2012123320223. The reversal of 2012123320221 is 1220233212102.

It is not a de Polignac number, because 2012123320221 - 2⁷ = 2012123320093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012123320223) 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, 977707096 + ... + 977709153.

It is an arithmetic number, because the mean of its divisors is an integer number (195541625000).

Almost surely, 2^{2012123320221} is an apocalyptic number.

2012123320221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2012123320221 is a deficient number, since it is larger than the sum of its proper divisors (1116542679779).

2012123320221 is an equidigital number, since it uses as much as digits as its factorization.

2012123320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955416273 (or 1955416259 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 2012123320221 its reverse (1220233212102), we get a palindrome (3232356532323).

The spelling of 2012123320221 in words is "two trillion, twelve billion, one hundred twenty-three million, three hundred twenty thousand, two hundred twenty-one".