1221001124 has 24 divisors (see below), whose sum is σ = 2447003328. Its totient is φ = 522214560.

The previous prime is 1221001097. The next prime is 1221001127. The reversal of 1221001124 is 4211001221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1221001099 and 1221001108.

It is not an unprimeable number, because it can be changed into a prime (1221001127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30659 + ... + 58154.

It is an arithmetic number, because the mean of its divisors is an integer number (101958472).

Almost surely, 2^1221001124 is an apocalyptic number.

1221001124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221001124 is an abundant number, since it is smaller than the sum of its proper divisors (1226002204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221001124 is a wasteful number, since it uses less digits than its factorization.

1221001124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89315 (or 89313 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221001124 is about 34942.8265027316. The cubic root of 1221001124 is about 1068.8219264019.

Adding to 1221001124 its reverse (4211001221), we get a palindrome (5432002345).

The spelling of 1221001124 in words is "one billion, two hundred twenty-one million, one thousand, one hundred twenty-four".