1221452056 has 32 divisors (see below), whose sum is σ = 2500650000. Its totient is φ = 554711040.

The previous prime is 1221452047. The next prime is 1221452059. The reversal of 1221452056 is 6502541221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221452059) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 104356 + ... + 115468.

Almost surely, 2^1221452056 is an apocalyptic number.

It is an amenable number.

1221452056 is an abundant number, since it is smaller than the sum of its proper divisors (1279197944).

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

1221452056 is a wasteful number, since it uses less digits than its factorization.

1221452056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12379 (or 12375 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1221452056 is about 34949.2783330357. The cubic root of 1221452056 is about 1068.9534869385.

Adding to 1221452056 its reverse (6502541221), we get a palindrome (7723993277).

The spelling of 1221452056 in words is "one billion, two hundred twenty-one million, four hundred fifty-two thousand, fifty-six".