1221252032 has 168 divisors, whose sum is σ = 3280367328. Its totient is φ = 438958080.

The previous prime is 1221252017. The next prime is 1221252049. The reversal of 1221252032 is 2302521221.

It is a junction number, because it is equal to n+sod(n) for n = 1221251995 and 1221252013.

It is a congruent 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 in 23 ways as a sum of consecutive naturals, for example, 703838 + ... + 705570.

It is an arithmetic number, because the mean of its divisors is an integer number (19525996).

Almost surely, 2^1221252032 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 1221252032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1640183664).

1221252032 is an abundant number, since it is smaller than the sum of its proper divisors (2059115296).

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

1221252032 is a wasteful number, since it uses less digits than its factorization.

1221252032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1766 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1221252032 is about 34946.4165831062. The cubic root of 1221252032 is about 1068.8951334338.

Adding to 1221252032 its reverse (2302521221), we get a palindrome (3523773253).

The spelling of 1221252032 in words is "one billion, two hundred twenty-one million, two hundred fifty-two thousand, thirty-two".