1211022321 has 24 divisors (see below), whose sum is σ = 1674023424. Its totient is φ = 778145760.

The previous prime is 1211022313. The next prime is 1211022341. The reversal of 1211022321 is 1232201121.

It is not a de Polignac number, because 1211022321 - 2³ = 1211022313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211022321.

It is not an unprimeable number, because it can be changed into a prime (1211022301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5066920 + ... + 5067158.

It is an arithmetic number, because the mean of its divisors is an integer number (69750976).

Almost surely, 2^1211022321 is an apocalyptic number.

It is an amenable number.

1211022321 is a deficient number, since it is larger than the sum of its proper divisors (463001103).

1211022321 is an equidigital number, since it uses as much as digits as its factorization.

1211022321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 470 counting only the distinct ones).

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

The square root of 1211022321 is about 34799.7459904523. The cubic root of 1211022321 is about 1065.9022590484.

Adding to 1211022321 its reverse (1232201121), we get a palindrome (2443223442).

The spelling of 1211022321 in words is "one billion, two hundred eleven million, twenty-two thousand, three hundred twenty-one".