1228822121 has 4 divisors (see below), whose sum is σ = 1229614932. Its totient is φ = 1228029312.

The previous prime is 1228822103. The next prime is 1228822151. The reversal of 1228822121 is 1212288221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 676572121 + 552250000 = 26011^2 + 23500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228822121 - 2⁶ = 1228822057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228822151) 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, 394076 + ... + 397181.

It is an arithmetic number, because the mean of its divisors is an integer number (307403733).

Almost surely, 2^1228822121 is an apocalyptic number.

It is an amenable number.

1228822121 is a deficient number, since it is larger than the sum of its proper divisors (792811).

1228822121 is an equidigital number, since it uses as much as digits as its factorization.

1228822121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792810.

The product of its digits is 2048, while the sum is 29.

The square root of 1228822121 is about 35054.5592041891. The cubic root of 1228822121 is about 1071.0991474047.

The spelling of 1228822121 in words is "one billion, two hundred twenty-eight million, eight hundred twenty-two thousand, one hundred twenty-one".