1221123124 has 48 divisors (see below), whose sum is σ = 2441009088. Its totient is φ = 529509888.

The previous prime is 1221123109. The next prime is 1221123149. The reversal of 1221123124 is 4213211221.

It is a super-2 number, since 2×1221123124² = 2982283367935038752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801027 + ... + 802549.

It is an arithmetic number, because the mean of its divisors is an integer number (50854356).

Almost surely, 2^1221123124 is an apocalyptic number.

It is an amenable number.

1221123124 is a deficient number, since it is larger than the sum of its proper divisors (1219885964).

1221123124 is a wasteful number, since it uses less digits than its factorization.

1221123124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2462 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 1221123124 is about 34944.5721679348. The cubic root of 1221123124 is about 1068.8575234023.

Adding to 1221123124 its reverse (4213211221), we get a palindrome (5434334345).

The spelling of 1221123124 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-four".