1221526242 has 12 divisors (see below), whose sum is σ = 2646640230. Its totient is φ = 407175408.

The previous prime is 1221526213. The next prime is 1221526247. The reversal of 1221526242 is 2426251221.

1221526242 is a `hidden beast` number, since 1 + 22 + 15 + 2 + 624 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 628555041 + 592971201 = 25071^2 + 24351^2 .

It is not an unprimeable number, because it can be changed into a prime (1221526247) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 33931267 + ... + 33931302.

Almost surely, 2^1221526242 is an apocalyptic number.

1221526242 is an abundant number, since it is smaller than the sum of its proper divisors (1425113988).

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

1221526242 is a wasteful number, since it uses less digits than its factorization.

1221526242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67862577 (or 67862574 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 1221526242 is about 34950.3396550019. The cubic root of 1221526242 is about 1068.9751277873.

Adding to 1221526242 its reverse (2426251221), we get a palindrome (3647777463).

The spelling of 1221526242 in words is "one billion, two hundred twenty-one million, five hundred twenty-six thousand, two hundred forty-two".