1221020032 has 16 divisors (see below), whose sum is σ = 2432501100. Its totient is φ = 610509952.

The previous prime is 1221019979. The next prime is 1221020069. The reversal of 1221020032 is 2300201221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221019994 and 1221020021.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4769482 + ... + 4769737.

Almost surely, 2^1221020032 is an apocalyptic number.

It is an amenable number.

1221020032 is a deficient number, since it is larger than the sum of its proper divisors (1211481068).

1221020032 is an frugal number, since it uses more digits than its factorization.

1221020032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9539233 (or 9539221 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221020032 is about 34943.0970579312. The cubic root of 1221020032 is about 1068.8274435087.

Adding to 1221020032 its reverse (2300201221), we get a palindrome (3521221253).

The spelling of 1221020032 in words is "one billion, two hundred twenty-one million, twenty thousand, thirty-two".