1210221011 has 4 divisors (see below), whose sum is σ = 1251952800. Its totient is φ = 1168489224.

The previous prime is 1210220989. The next prime is 1210221013. The reversal of 1210221011 is 1101220121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1210221011 - 2¹⁴ = 1210204627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210220983 and 1210221001.

It is not an unprimeable number, because it can be changed into a prime (1210221013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20865851 + ... + 20865908.

It is an arithmetic number, because the mean of its divisors is an integer number (312988200).

Almost surely, 2^1210221011 is an apocalyptic number.

1210221011 is a deficient number, since it is larger than the sum of its proper divisors (41731789).

1210221011 is an equidigital number, since it uses as much as digits as its factorization.

1210221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41731788.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1210221011 is about 34788.2309265648. The cubic root of 1210221011 is about 1065.6671115541.

Adding to 1210221011 its reverse (1101220121), we get a palindrome (2311441132).

The spelling of 1210221011 in words is "one billion, two hundred ten million, two hundred twenty-one thousand, eleven".