1228228221 has 32 divisors (see below), whose sum is σ = 1907592192. Its totient is φ = 695439360.

The previous prime is 1228228163. The next prime is 1228228237.

1228228221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1228228221 - 2¹⁰ = 1228227197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228218221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13821 + ... + 51453.

It is an arithmetic number, because the mean of its divisors is an integer number (59612256).

Almost surely, 2^1228228221 is an apocalyptic number.

1228228221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1228228221 is a deficient number, since it is larger than the sum of its proper divisors (679363971).

1228228221 is a wasteful number, since it uses less digits than its factorization.

1228228221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37713.

The product of its digits is 4096, while the sum is 30.

The square root of 1228228221 is about 35046.0870997034. The cubic root of 1228228221 is about 1070.9265625415.

The spelling of 1228228221 in words is "one billion, two hundred twenty-eight million, two hundred twenty-eight thousand, two hundred twenty-one".