1221526241 has 8 divisors (see below), whose sum is σ = 1346083200. Its totient is φ = 1101339792.

The previous prime is 1221526213. The next prime is 1221526247. The reversal of 1221526241 is 1426251221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221526241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221526241.

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 7 ways as a sum of consecutive naturals, for example, 1092041 + ... + 1093158.

It is an arithmetic number, because the mean of its divisors is an integer number (168260400).

Almost surely, 2^1221526241 is an apocalyptic number.

It is an amenable number.

1221526241 is a deficient number, since it is larger than the sum of its proper divisors (124556959).

1221526241 is a wasteful number, since it uses less digits than its factorization.

1221526241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185255.

The product of its digits is 1920, while the sum is 26.

The square root of 1221526241 is about 34950.3396406959. The cubic root of 1221526241 is about 1068.9751274956.

Adding to 1221526241 its reverse (1426251221), we get a palindrome (2647777462).

The spelling of 1221526241 in words is "one billion, two hundred twenty-one million, five hundred twenty-six thousand, two hundred forty-one".