1228491021 has 8 divisors (see below), whose sum is σ = 1638378144. Its totient is φ = 818798960.

The previous prime is 1228491013. The next prime is 1228491041. The reversal of 1228491021 is 1201948221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1228491021 - 2³ = 1228491013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1228491021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228491041) 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 7 ways as a sum of consecutive naturals, for example, 33375 + ... + 59756.

It is an arithmetic number, because the mean of its divisors is an integer number (204797268).

Almost surely, 2^1228491021 is an apocalyptic number.

It is an amenable number.

1228491021 is a deficient number, since it is larger than the sum of its proper divisors (409887123).

1228491021 is an equidigital number, since it uses as much as digits as its factorization.

1228491021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97531.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1228491021 is about 35049.8362478343. The cubic root of 1228491021 is about 1071.0029379863.

The spelling of 1228491021 in words is "one billion, two hundred twenty-eight million, four hundred ninety-one thousand, twenty-one".