1221203232 has 36 divisors (see below), whose sum is σ = 3472797510. Its totient is φ = 407067648.

The previous prime is 1221203201. The next prime is 1221203233. The reversal of 1221203232 is 2323021221.

It can be written as a sum of positive squares in only one way, i.e., 1216893456 + 4309776 = 34884^2 + 2076^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221203233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2119857 + ... + 2120432.

Almost surely, 2^1221203232 is an apocalyptic number.

1221203232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221203232 is an abundant number, since it is smaller than the sum of its proper divisors (2251594278).

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

1221203232 is a wasteful number, since it uses less digits than its factorization.

1221203232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240305 (or 4240294 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221203232 is about 34945.7183643433. The cubic root of 1221203232 is about 1068.8808959202.

Adding to 1221203232 its reverse (2323021221), we get a palindrome (3544224453).

The spelling of 1221203232 in words is "one billion, two hundred twenty-one million, two hundred three thousand, two hundred thirty-two".