1221103552 has 56 divisors (see below), whose sum is σ = 2559751040. Its totient is φ = 576357120.

The previous prime is 1221103549. The next prime is 1221103567. The reversal of 1221103552 is 2553011221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371677 + ... + 374947.

It is an arithmetic number, because the mean of its divisors is an integer number (45709840).

Almost surely, 2^1221103552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221103552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1279875520).

1221103552 is an abundant number, since it is smaller than the sum of its proper divisors (1338647488).

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

1221103552 is a wasteful number, since it uses less digits than its factorization.

1221103552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3599 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1221103552 is about 34944.2921233211. The cubic root of 1221103552 is about 1068.8518128694.

Adding to 1221103552 its reverse (2553011221), we get a palindrome (3774114773).

The spelling of 1221103552 in words is "one billion, two hundred twenty-one million, one hundred three thousand, five hundred fifty-two".