1220667121 has 4 divisors (see below), whose sum is σ = 1220815332. Its totient is φ = 1220518912.

The previous prime is 1220667083. The next prime is 1220667131. The reversal of 1220667121 is 1217660221.

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 659924721 + 560742400 = 25689^2 + 23680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220667121 - 2¹¹ = 1220665073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220667121.

It is not an unprimeable number, because it can be changed into a prime (1220667131) 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, 60976 + ... + 78481.

It is an arithmetic number, because the mean of its divisors is an integer number (305203833).

Almost surely, 2^1220667121 is an apocalyptic number.

It is an amenable number.

1220667121 is a deficient number, since it is larger than the sum of its proper divisors (148211).

1220667121 is an equidigital number, since it uses as much as digits as its factorization.

1220667121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148210.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1220667121 is about 34938.0468973296. The cubic root of 1220667121 is about 1068.7244593101.

The spelling of 1220667121 in words is "one billion, two hundred twenty million, six hundred sixty-seven thousand, one hundred twenty-one".