1227557221 has 24 divisors (see below), whose sum is σ = 1392733440. Its totient is φ = 1080599520.

The previous prime is 1227557209. The next prime is 1227557231.

1227557221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1227557221 - 2²¹ = 1225460069 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 (1227557231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505416 + ... + 507838.

It is an arithmetic number, because the mean of its divisors is an integer number (58030560).

Almost surely, 2^1227557221 is an apocalyptic number.

1227557221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1227557221 is a deficient number, since it is larger than the sum of its proper divisors (165176219).

1227557221 is a wasteful number, since it uses less digits than its factorization.

1227557221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2566 counting only the distinct ones).

The product of its digits is 19600, while the sum is 34.

The square root of 1227557221 is about 35036.5126831995. The cubic root of 1227557221 is about 1070.7315057895.

It can be divided in two parts, 12275 and 57221, that added together give a palindrome (69496).

The spelling of 1227557221 in words is "one billion, two hundred twenty-seven million, five hundred fifty-seven thousand, two hundred twenty-one".