1221563632 has 10 divisors (see below), whose sum is σ = 2366779568. Its totient is φ = 610781808.

The previous prime is 1221563593. The next prime is 1221563633. The reversal of 1221563632 is 2363651221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221563594 and 1221563603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221563633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38173848 + ... + 38173879.

Almost surely, 2^1221563632 is an apocalyptic number.

It is an amenable number.

1221563632 is a deficient number, since it is larger than the sum of its proper divisors (1145215936).

1221563632 is an equidigital number, since it uses as much as digits as its factorization.

1221563632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76347735 (or 76347729 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 1221563632 is about 34950.8745527204. The cubic root of 1221563632 is about 1068.9860345177.

The spelling of 1221563632 in words is "one billion, two hundred twenty-one million, five hundred sixty-three thousand, six hundred thirty-two".