1221350532 has 12 divisors (see below), whose sum is σ = 2849817936. Its totient is φ = 407116840.

The previous prime is 1221350527. The next prime is 1221350539. The reversal of 1221350532 is 2350531221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1221350539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50889594 + ... + 50889617.

It is an arithmetic number, because the mean of its divisors is an integer number (237484828).

Almost surely, 2^1221350532 is an apocalyptic number.

1221350532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221350532 is an abundant number, since it is smaller than the sum of its proper divisors (1628467404).

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

1221350532 is a wasteful number, since it uses less digits than its factorization.

1221350532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101779218 (or 101779216 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1221350532 is about 34947.8258551229. The cubic root of 1221350532 is about 1068.9238698828.

Adding to 1221350532 its reverse (2350531221), we get a palindrome (3571881753).

The spelling of 1221350532 in words is "one billion, two hundred twenty-one million, three hundred fifty thousand, five hundred thirty-two".