1152021221 has 16 divisors (see below), whose sum is σ = 1260443520. Its totient is φ = 1046485440.

The previous prime is 1152021203. The next prime is 1152021229. The reversal of 1152021221 is 1221202511.

It is not a de Polignac number, because 1152021221 - 2¹⁴ = 1152004837 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 1152021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1152021229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792131 + ... + 793583.

It is an arithmetic number, because the mean of its divisors is an integer number (78777720).

Almost surely, 2^1152021221 is an apocalyptic number.

It is an amenable number.

1152021221 is a deficient number, since it is larger than the sum of its proper divisors (108422299).

1152021221 is a wasteful number, since it uses less digits than its factorization.

1152021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1152021221 is about 33941.4381103689. The cubic root of 1152021221 is about 1048.3029945368.

Adding to 1152021221 its reverse (1221202511), we get a palindrome (2373223732).

The spelling of 1152021221 in words is "one billion, one hundred fifty-two million, twenty-one thousand, two hundred twenty-one".