1220521253 has 8 divisors (see below), whose sum is σ = 1423348800. Its totient is φ = 1046160780.

The previous prime is 1220521241. The next prime is 1220521301. The reversal of 1220521253 is 3521250221.

It is not a de Polignac number, because 1220521253 - 2⁶ = 1220521189 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 (1220521853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778843 + ... + 1779528.

It is an arithmetic number, because the mean of its divisors is an integer number (177918600).

Almost surely, 2^1220521253 is an apocalyptic number.

It is an amenable number.

1220521253 is a deficient number, since it is larger than the sum of its proper divisors (202827547).

1220521253 is an frugal number, since it uses more digits than its factorization.

1220521253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558392 (or 3558378 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1220521253 is about 34935.9593112884. The cubic root of 1220521253 is about 1068.6818872589.

Adding to 1220521253 its reverse (3521250221), we get a palindrome (4741771474).

The spelling of 1220521253 in words is "one billion, two hundred twenty million, five hundred twenty-one thousand, two hundred fifty-three".