1221120004 has 24 divisors (see below), whose sum is σ = 2317911680. Its totient is φ = 559535904.

The previous prime is 1221120001. The next prime is 1221120007. The reversal of 1221120004 is 4000211221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221120001) and next prime (1221120007).

It is a super-2 number, since 2×1221120004² = 2982268128337920032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1221120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77244 + ... + 91699.

Almost surely, 2^1221120004 is an apocalyptic number.

It is an amenable number.

1221120004 is a deficient number, since it is larger than the sum of its proper divisors (1096791676).

1221120004 is a wasteful number, since it uses less digits than its factorization.

1221120004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169099 (or 169097 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1221120004 is about 34944.5275257801. The cubic root of 1221120004 is about 1068.8566130823.

Adding to 1221120004 its reverse (4000211221), we get a palindrome (5221331225).

The spelling of 1221120004 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, four".