1221004 has 12 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 608144.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1221004 is 4001221.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134 + ... + 1930.

It is an arithmetic number, because the mean of its divisors is an integer number (178752).

2^1221004 is an apocalyptic number.

It is an amenable number.

1221004 is a deficient number, since it is larger than the sum of its proper divisors (924020).

1221004 is a wasteful number, since it uses less digits than its factorization.

1221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1182 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1221004 is about 1104.9904976967. The cubic root of 1221004 is about 106.8822765585.

Adding to 1221004 its reverse (4001221), we get a palindrome (5222225).

The spelling of 1221004 in words is "one million, two hundred twenty-one thousand, four".