1223320123021 has 4 divisors (see below), whose sum is σ = 1224486301500. Its totient is φ = 1222153944544.

The previous prime is 1223320123019. The next prime is 1223320123031. The reversal of 1223320123021 is 1203210233221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 509312022921 + 714008100100 = 713661^2 + 844990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223320123021 - 2¹ = 1223320123019 is a prime.

It is a super-2 number, since 2×1223320123021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223320122983 and 1223320123001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223320123031) 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, 583087666 + ... + 583089763.

It is an arithmetic number, because the mean of its divisors is an integer number (306121575375).

Almost surely, 2^{1223320123021} is an apocalyptic number.

It is an amenable number.

1223320123021 is a deficient number, since it is larger than the sum of its proper divisors (1166178479).

1223320123021 is a wasteful number, since it uses less digits than its factorization.

1223320123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166178478.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1223320123021 its reverse (1203210233221), we get a palindrome (2426530356242).

The spelling of 1223320123021 in words is "one trillion, two hundred twenty-three billion, three hundred twenty million, one hundred twenty-three thousand, twenty-one".