1221323104 has 48 divisors (see below), whose sum is σ = 2429028000. Its totient is φ = 604463104.

The previous prime is 1221323063. The next prime is 1221323119. The reversal of 1221323104 is 4013231221.

It is a happy number.

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, 2399202 + ... + 2399710.

It is an arithmetic number, because the mean of its divisors is an integer number (50604750).

Almost surely, 2^1221323104 is an apocalyptic number.

It is an amenable number.

1221323104 is a deficient number, since it is larger than the sum of its proper divisors (1207704896).

1221323104 is a wasteful number, since it uses less digits than its factorization.

1221323104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221323104 is about 34947.4334393815. The cubic root of 1221323104 is about 1068.9158681768.

Adding to 1221323104 its reverse (4013231221), we get a palindrome (5234554325).

The spelling of 1221323104 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, one hundred four".