13122055621 has 4 divisors (see below), whose sum is σ = 13122457600. Its totient is φ = 13121653644.

The previous prime is 13122055619. The next prime is 13122055649. The reversal of 13122055621 is 12655022131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12655022131 = 46829 ⋅270239.

It is a cyclic number.

It is not a de Polignac number, because 13122055621 - 2¹ = 13122055619 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 13122055621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13122005621) 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, 147231 + ... + 218908.

It is an arithmetic number, because the mean of its divisors is an integer number (3280614400).

Almost surely, 2^13122055621 is an apocalyptic number.

It is an amenable number.

13122055621 is a deficient number, since it is larger than the sum of its proper divisors (401979).

13122055621 is an equidigital number, since it uses as much as digits as its factorization.

13122055621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401978.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 13122055621 its reverse (12655022131), we get a palindrome (25777077752).

The spelling of 13122055621 in words is "thirteen billion, one hundred twenty-two million, fifty-five thousand, six hundred twenty-one".