1221533124 has 24 divisors (see below), whose sum is σ = 3257421888. Its totient is φ = 349009440.

The previous prime is 1221533119. The next prime is 1221533129. The reversal of 1221533124 is 4213351221.

It is an interprime number because it is at equal distance from previous prime (1221533119) and next prime (1221533129).

It is a junction number, because it is equal to n+sod(n) for n = 1221533094 and 1221533103.

It is not an unprimeable number, because it can be changed into a prime (1221533129) 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, 7270947 + ... + 7271114.

It is an arithmetic number, because the mean of its divisors is an integer number (135725912).

Almost surely, 2^1221533124 is an apocalyptic number.

1221533124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221533124 is an abundant number, since it is smaller than the sum of its proper divisors (2035888764).

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

1221533124 is a wasteful number, since it uses less digits than its factorization.

1221533124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14542075 (or 14542073 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 1221533124 is about 34950.4381088421. The cubic root of 1221533124 is about 1068.9771352958.

Adding to 1221533124 its reverse (4213351221), we get a palindrome (5434884345).

The spelling of 1221533124 in words is "one billion, two hundred twenty-one million, five hundred thirty-three thousand, one hundred twenty-four".