1323213220021 has 24 divisors (see below), whose sum is σ = 1679258615904. Its totient is φ = 1031026762080.

The previous prime is 1323213220019. The next prime is 1323213220033. The reversal of 1323213220021 is 1200223123231.

It is not a de Polignac number, because 1323213220021 - 2¹ = 1323213220019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323213219974 and 1323213220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323213220321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15114651 + ... + 15201943.

It is an arithmetic number, because the mean of its divisors is an integer number (69969108996).

Almost surely, 2^{1323213220021} is an apocalyptic number.

1323213220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1323213220021 is a deficient number, since it is larger than the sum of its proper divisors (356045395883).

1323213220021 is a wasteful number, since it uses less digits than its factorization.

1323213220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115441 (or 115434 counting only the distinct ones).

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

Adding to 1323213220021 its reverse (1200223123231), we get a palindrome (2523436343252).

The spelling of 1323213220021 in words is "one trillion, three hundred twenty-three billion, two hundred thirteen million, two hundred twenty thousand, twenty-one".