1223210311021 has 4 divisors (see below), whose sum is σ = 1224096054844. Its totient is φ = 1222324567200.

The previous prime is 1223210310983. The next prime is 1223210311039. The reversal of 1223210311021 is 1201130123221.

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 160484366025 + 1062725944996 = 400605^2 + 1030886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223210311021 - 2¹³ = 1223210302829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223210311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223210311051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442869840 + ... + 442872601.

It is an arithmetic number, because the mean of its divisors is an integer number (306024013711).

Almost surely, 2^{1223210311021} is an apocalyptic number.

It is an amenable number.

1223210311021 is a deficient number, since it is larger than the sum of its proper divisors (885743823).

1223210311021 is an equidigital number, since it uses as much as digits as its factorization.

1223210311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885743822.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1223210311021 its reverse (1201130123221), we get a palindrome (2424340434242).

The spelling of 1223210311021 in words is "one trillion, two hundred twenty-three billion, two hundred ten million, three hundred eleven thousand, twenty-one".