1221054552 has 24 divisors (see below), whose sum is σ = 3307022940. Its totient is φ = 407018160.

The previous prime is 1221054539. The next prime is 1221054557. The reversal of 1221054552 is 2554501221.

1221054552 is a `hidden beast` number, since 1 + 2 + 2 + 105 + 4 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221054557) 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 5 ways as a sum of consecutive naturals, for example, 8479474 + ... + 8479617.

Almost surely, 2^1221054552 is an apocalyptic number.

1221054552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221054552 is an abundant number, since it is smaller than the sum of its proper divisors (2085968388).

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

1221054552 is a wasteful number, since it uses less digits than its factorization.

1221054552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16959103 (or 16959096 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1221054552 is about 34943.5910003537. The cubic root of 1221054552 is about 1068.8375158457.

Adding to 1221054552 its reverse (2554501221), we get a palindrome (3775555773).

The spelling of 1221054552 in words is "one billion, two hundred twenty-one million, fifty-four thousand, five hundred fifty-two".