1211221302 has 32 divisors (see below), whose sum is σ = 2480385024. Its totient is φ = 394128000.

The previous prime is 1211221237. The next prime is 1211221309. The reversal of 1211221302 is 2031221121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221309) 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 15 ways as a sum of consecutive naturals, for example, 107727 + ... + 118437.

It is an arithmetic number, because the mean of its divisors is an integer number (77512032).

Almost surely, 2^1211221302 is an apocalyptic number.

1211221302 is an abundant number, since it is smaller than the sum of its proper divisors (1269163722).

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

1211221302 is a wasteful number, since it uses less digits than its factorization.

1211221302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11164.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1211221302 is about 34802.6048163065. The cubic root of 1211221302 is about 1065.9606347085.

Adding to 1211221302 its reverse (2031221121), we get a palindrome (3242442423).

The spelling of 1211221302 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, three hundred two".