1221064032 has 192 divisors, whose sum is σ = 3644766720. Its totient is φ = 355590144.

The previous prime is 1221064021. The next prime is 1221064037. The reversal of 1221064032 is 2304601221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221064037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1643053 + ... + 1643795.

It is an arithmetic number, because the mean of its divisors is an integer number (18983160).

Almost surely, 2^1221064032 is an apocalyptic number.

1221064032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221064032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822383360).

1221064032 is an abundant number, since it is smaller than the sum of its proper divisors (2423702688).

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

1221064032 is a wasteful number, since it uses less digits than its factorization.

1221064032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1221064032 is about 34943.7266472825. The cubic root of 1221064032 is about 1068.8402819119.

Adding to 1221064032 its reverse (2304601221), we get a palindrome (3525665253).

The spelling of 1221064032 in words is "one billion, two hundred twenty-one million, sixty-four thousand, thirty-two".