1221123304 has 8 divisors (see below), whose sum is σ = 2289606210. Its totient is φ = 610561648.

The previous prime is 1221123257. The next prime is 1221123317. The reversal of 1221123304 is 4033211221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 876278404 + 344844900 = 29602^2 + 18570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1221123304² = 2982284247143752832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76320199 + ... + 76320214.

Almost surely, 2^1221123304 is an apocalyptic number.

It is an amenable number.

1221123304 is a deficient number, since it is larger than the sum of its proper divisors (1068482906).

1221123304 is a wasteful number, since it uses less digits than its factorization.

1221123304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152640419 (or 152640415 counting only the distinct ones).

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

The square root of 1221123304 is about 34944.5747434419. The cubic root of 1221123304 is about 1068.8575759207.

Adding to 1221123304 its reverse (4033211221), we get a palindrome (5254334525).

The spelling of 1221123304 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, three hundred four".