1221456064 has 14 divisors (see below), whose sum is σ = 2423827004. Its totient is φ = 610728000.

The previous prime is 1221456053. The next prime is 1221456077. The reversal of 1221456064 is 4606541221.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9542562 + ... + 9542689.

Almost surely, 2^1221456064 is an apocalyptic number.

It is an amenable number.

1221456064 is a deficient number, since it is larger than the sum of its proper divisors (1202370940).

1221456064 is an equidigital number, since it uses as much as digits as its factorization.

1221456064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085263 (or 19085253 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1221456064 is about 34949.3356732285. The cubic root of 1221456064 is about 1068.9546561373.

Adding to 1221456064 its reverse (4606541221), we get a palindrome (5827997285).

The spelling of 1221456064 in words is "one billion, two hundred twenty-one million, four hundred fifty-six thousand, sixty-four".