1221200032 has 48 divisors (see below), whose sum is σ = 2741499432. Its totient is φ = 530472960.

The previous prime is 1221200023. The next prime is 1221200039. The reversal of 1221200032 is 2300021221.

It can be written as a sum of positive squares in 4 ways, for example, as 838449936 + 382750096 = 28956^2 + 19564^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1221199985 and 1221200021.

It is not an unprimeable number, because it can be changed into a prime (1221200039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79269 + ... + 93412.

Almost surely, 2^1221200032 is an apocalyptic number.

It is an amenable number.

1221200032 is an abundant number, since it is smaller than the sum of its proper divisors (1520299400).

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

1221200032 is a wasteful number, since it uses less digits than its factorization.

1221200032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172721 (or 172713 counting only the distinct ones).

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

The square root of 1221200032 is about 34945.6725790190. The cubic root of 1221200032 is about 1068.8799622995.

Adding to 1221200032 its reverse (2300021221), we get a palindrome (3521221253).

The spelling of 1221200032 in words is "one billion, two hundred twenty-one million, two hundred thousand, thirty-two".