1220312221 has 8 divisors (see below), whose sum is σ = 1285452320. Its totient is φ = 1155263472.

The previous prime is 1220312201. The next prime is 1220312237. The reversal of 1220312221 is 1222130221.

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 1220312221 - 2¹¹ = 1220310173 is a prime.

It is a super-5 number, since 5×1220312221⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220312195 and 1220312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5506 + ... + 49708.

It is an arithmetic number, because the mean of its divisors is an integer number (160681540).

Almost surely, 2^1220312221 is an apocalyptic number.

It is an amenable number.

1220312221 is a deficient number, since it is larger than the sum of its proper divisors (65140099).

1220312221 is a wasteful number, since it uses less digits than its factorization.

1220312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45675.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220312221 is about 34932.9675378431. The cubic root of 1220312221 is about 1068.6208746749.

Adding to 1220312221 its reverse (1222130221), we get a palindrome (2442442442).

The spelling of 1220312221 in words is "one billion, two hundred twenty million, three hundred twelve thousand, two hundred twenty-one".