1221127552 has 16 divisors (see below), whose sum is σ = 2432715300. Its totient is φ = 610563712.

The previous prime is 1221127519. The next prime is 1221127571. The reversal of 1221127552 is 2557211221.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 1221127552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4769902 + ... + 4770157.

Almost surely, 2^1221127552 is an apocalyptic number.

It is an amenable number.

1221127552 is a deficient number, since it is larger than the sum of its proper divisors (1211587748).

1221127552 is an frugal number, since it uses more digits than its factorization.

1221127552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540073 (or 9540061 counting only the distinct ones).

The product of its digits is 2800, while the sum is 28.

The square root of 1221127552 is about 34944.6355253564. The cubic root of 1221127552 is about 1068.8588153537.

Adding to 1221127552 its reverse (2557211221), we get a palindrome (3778338773).

The spelling of 1221127552 in words is "one billion, two hundred twenty-one million, one hundred twenty-seven thousand, five hundred fifty-two".