1220220544523 has 4 divisors (see below), whose sum is σ = 1220224328688. Its totient is φ = 1220216760360.

The previous prime is 1220220544507. The next prime is 1220220544583. The reversal of 1220220544523 is 3254450220221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220220544523 - 2⁴ = 1220220544507 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 1220220544523.

It is not an unprimeable number, because it can be changed into a prime (1220220544583) 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, 1358183 + ... + 2070048.

It is an arithmetic number, because the mean of its divisors is an integer number (305056082172).

Almost surely, 2^{1220220544523} is an apocalyptic number.

1220220544523 is a deficient number, since it is larger than the sum of its proper divisors (3784165).

1220220544523 is an equidigital number, since it uses as much as digits as its factorization.

1220220544523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784164.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 1220220544523 its reverse (3254450220221), we get a palindrome (4474670764744).

The spelling of 1220220544523 in words is "one trillion, two hundred twenty billion, two hundred twenty million, five hundred forty-four thousand, five hundred twenty-three".