1221135524 has 24 divisors (see below), whose sum is σ = 2447594688. Its totient is φ = 522203040.

The previous prime is 1221135499. The next prime is 1221135541. The reversal of 1221135524 is 4255311221.

It is a junction number, because it is equal to n+sod(n) for n = 1221135493 and 1221135502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34394 + ... + 60209.

It is an arithmetic number, because the mean of its divisors is an integer number (101983112).

Almost surely, 2^1221135524 is an apocalyptic number.

1221135524 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221135524 is an abundant number, since it is smaller than the sum of its proper divisors (1226459164).

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

1221135524 is a wasteful number, since it uses less digits than its factorization.

1221135524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95075 (or 95073 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 1221135524 is about 34944.7495913192. The cubic root of 1221135524 is about 1068.8611413253.

Adding to 1221135524 its reverse (4255311221), we get a palindrome (5476446745).

The spelling of 1221135524 in words is "one billion, two hundred twenty-one million, one hundred thirty-five thousand, five hundred twenty-four".