1220310221 has 8 divisors (see below), whose sum is σ = 1318860984. Its totient is φ = 1122428160.

The previous prime is 1220310193. The next prime is 1220310229. The reversal of 1220310221 is 1220130221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6832996 + 1213477225 = 2614^2 + 34835^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220310221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220310196 and 1220310205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220310229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163376 + ... + 170681.

It is an arithmetic number, because the mean of its divisors is an integer number (164857623).

Almost surely, 2^1220310221 is an apocalyptic number.

It is an amenable number.

1220310221 is a deficient number, since it is larger than the sum of its proper divisors (98550763).

1220310221 is a wasteful number, since it uses less digits than its factorization.

1220310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334351.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1220310221 is about 34932.9389115774. The cubic root of 1220310221 is about 1068.6202908782.

Adding to 1220310221 its reverse (1220130221), we get a palindrome (2440440442).

The spelling of 1220310221 in words is "one billion, two hundred twenty million, three hundred ten thousand, two hundred twenty-one".