2123311222221 has 16 divisors (see below), whose sum is σ = 3376196726784. Its totient is φ = 1160567624304.

The previous prime is 2123311222217. The next prime is 2123311222247. The reversal of 2123311222221 is 1222221133212.

It is not a de Polignac number, because 2123311222221 - 2² = 2123311222217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123311222191 and 2123311222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123311222621) 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, 2198044261 + ... + 2198045226.

It is an arithmetic number, because the mean of its divisors is an integer number (211012295424).

Almost surely, 2^{2123311222221} is an apocalyptic number.

2123311222221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2123311222221 is a deficient number, since it is larger than the sum of its proper divisors (1252885504563).

2123311222221 is a wasteful number, since it uses less digits than its factorization.

2123311222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396089520.

The product of its digits is 1152, while the sum is 24.

Adding to 2123311222221 its reverse (1222221133212), we get a palindrome (3345532355433).

The spelling of 2123311222221 in words is "two trillion, one hundred twenty-three billion, three hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".