1211022221 has 8 divisors (see below), whose sum is σ = 1229696064. Its totient is φ = 1192393440.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022221 is 1222201121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211022221 - 2⁶ = 1211022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022196 and 1211022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45041 + ... + 66713.

It is an arithmetic number, because the mean of its divisors is an integer number (153712008).

Almost surely, 2^1211022221 is an apocalyptic number.

It is an amenable number.

1211022221 is a deficient number, since it is larger than the sum of its proper divisors (18673843).

1211022221 is an equidigital number, since it uses as much as digits as its factorization.

1211022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22531.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1211022221 is about 34799.7445536602. The cubic root of 1211022221 is about 1065.9022297095.

Adding to 1211022221 its reverse (1222201121), we get a palindrome (2433223342).

The spelling of 1211022221 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".