13220653145621 has 4 divisors (see below), whose sum is σ = 13220718020544. Its totient is φ = 13220588270700.

The previous prime is 13220653145527. The next prime is 13220653145681. The reversal of 13220653145621 is 12654135602231.

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 13220653145621 - 2²² = 13220648951317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220653145681) 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, 32130815 + ... + 32539676.

It is an arithmetic number, because the mean of its divisors is an integer number (3305179505136).

Almost surely, 2^{13220653145621} is an apocalyptic number.

It is an amenable number.

13220653145621 is a deficient number, since it is larger than the sum of its proper divisors (64874923).

13220653145621 is an equidigital number, since it uses as much as digits as its factorization.

13220653145621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64874922.

The product of its (nonzero) digits is 259200, while the sum is 41.

Adding to 13220653145621 its reverse (12654135602231), we get a palindrome (25874788747852).

The spelling of 13220653145621 in words is "thirteen trillion, two hundred twenty billion, six hundred fifty-three million, one hundred forty-five thousand, six hundred twenty-one".