1221204 has 24 divisors (see below), whose sum is σ = 2872800. Its totient is φ = 403744.

The previous prime is 1221197. The next prime is 1221221. The reversal of 1221204 is 4021221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1221204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^1221204 is an apocalyptic number.

It is an amenable number.

1221204 is an abundant number, since it is smaller than the sum of its proper divisors (1651596).

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

1221204 is a wasteful number, since it uses less digits than its factorization.

1221204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1221204 is about 1105.0809925069. The cubic root of 1221204 is about 106.8881119989. Note that the first 3 decimals are identical.

Adding to 1221204 its reverse (4021221), we get a palindrome (5242425).

It can be divided in two parts, 122 and 1204, that added together give a triangular number (1326 = T₅₁).

The spelling of 1221204 in words is "one million, two hundred twenty-one thousand, two hundred four".