2021121232223 has 4 divisors (see below), whose sum is σ = 2064123811680. Its totient is φ = 1978118652768.

The previous prime is 2021121232219. The next prime is 2021121232231. The reversal of 2021121232223 is 3222321211202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021121232223 - 2² = 2021121232219 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 (2021121132223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21501289658 + ... + 21501289751.

It is an arithmetic number, because the mean of its divisors is an integer number (516030952920).

Almost surely, 2^{2021121232223} is an apocalyptic number.

2021121232223 is a deficient number, since it is larger than the sum of its proper divisors (43002579457).

2021121232223 is an equidigital number, since it uses as much as digits as its factorization.

2021121232223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43002579456.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2021121232223 its reverse (3222321211202), we get a palindrome (5243442443425).

The spelling of 2021121232223 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred twenty-three".