1221568338 has 32 divisors (see below), whose sum is σ = 2509125696. Its totient is φ = 396260928.

The previous prime is 1221568333. The next prime is 1221568367. The reversal of 1221568338 is 8338651221.

1221568338 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1221568296 and 1221568305.

It is not an unprimeable number, because it can be changed into a prime (1221568331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62920 + ... + 80012.

It is an arithmetic number, because the mean of its divisors is an integer number (78410178).

Almost surely, 2^1221568338 is an apocalyptic number.

1221568338 is an abundant number, since it is smaller than the sum of its proper divisors (1287557358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221568338 is a wasteful number, since it uses less digits than its factorization.

1221568338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17418.

The product of its digits is 69120, while the sum is 39.

The square root of 1221568338 is about 34950.9418757206. The cubic root of 1221568338 is about 1068.9874072506.

The spelling of 1221568338 in words is "one billion, two hundred twenty-one million, five hundred sixty-eight thousand, three hundred thirty-eight".