1220415321 has 8 divisors (see below), whose sum is σ = 1627546144. Its totient is φ = 813447360.

The previous prime is 1220415311. The next prime is 1220415337. The reversal of 1220415321 is 1235140221.

1220415321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1220415321 - 2⁹ = 1220414809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220415311) 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, 22000 + ... + 54081.

It is an arithmetic number, because the mean of its divisors is an integer number (203443268).

Almost surely, 2^1220415321 is an apocalyptic number.

It is an amenable number.

1220415321 is a deficient number, since it is larger than the sum of its proper divisors (407130823).

1220415321 is an equidigital number, since it uses as much as digits as its factorization.

1220415321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81431.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1220415321 is about 34934.4431900667. The cubic root of 1220415321 is about 1068.6509685333.

Adding to 1220415321 its reverse (1235140221), we get a palindrome (2455555542).

The spelling of 1220415321 in words is "one billion, two hundred twenty million, four hundred fifteen thousand, three hundred twenty-one".