13223120021 has 4 divisors (see below), whose sum is σ = 13254679200. Its totient is φ = 13191560844.

The previous prime is 13223120011. The next prime is 13223120033. The reversal of 13223120021 is 12002132231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13223120021 - 2²² = 13218925717 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 (13223120011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15778961 + ... + 15779798.

It is an arithmetic number, because the mean of its divisors is an integer number (3313669800).

Almost surely, 2^13223120021 is an apocalyptic number.

It is an amenable number.

13223120021 is a deficient number, since it is larger than the sum of its proper divisors (31559179).

13223120021 is an equidigital number, since it uses as much as digits as its factorization.

13223120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31559178.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13223120021 its reverse (12002132231), we get a palindrome (25225252252).

The spelling of 13223120021 in words is "thirteen billion, two hundred twenty-three million, one hundred twenty thousand, twenty-one".