1220216407 has 4 divisors (see below), whose sum is σ = 1220289840. Its totient is φ = 1220142976.

The previous prime is 1220216369. The next prime is 1220216419. The reversal of 1220216407 is 7046120221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1220216407 - 2¹⁵ = 1220183639 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 (1220216467) 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, 1398 + ... + 49420.

It is an arithmetic number, because the mean of its divisors is an integer number (305072460).

Almost surely, 2^1220216407 is an apocalyptic number.

1220216407 is a deficient number, since it is larger than the sum of its proper divisors (73433).

1220216407 is an equidigital number, since it uses as much as digits as its factorization.

1220216407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73432.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1220216407 is about 34931.5961129749. The cubic root of 1220216407 is about 1068.5929060074.

Adding to 1220216407 its reverse (7046120221), we get a palindrome (8266336628).

The spelling of 1220216407 in words is "one billion, two hundred twenty million, two hundred sixteen thousand, four hundred seven".