1111021221 has 8 divisors (see below), whose sum is σ = 1483828864. Its totient is φ = 739447200.

The previous prime is 1111021211. The next prime is 1111021231. The reversal of 1111021221 is 1221201111.

It is an interprime number because it is at equal distance from previous prime (1111021211) and next prime (1111021231).

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

It is not a de Polignac number, because 1111021221 - 2¹⁴ = 1111004837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111021197 and 1111021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111021201) 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, 306301 + ... + 309906.

It is an arithmetic number, because the mean of its divisors is an integer number (185478608).

Almost surely, 2^1111021221 is an apocalyptic number.

It is an amenable number.

1111021221 is a deficient number, since it is larger than the sum of its proper divisors (372807643).

1111021221 is an equidigital number, since it uses as much as digits as its factorization.

1111021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616811.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1111021221 is about 33331.9849543948. The cubic root of 1111021221 is about 1035.7162369505.

Adding to 1111021221 its reverse (1221201111), we get a palindrome (2332222332).

The spelling of 1111021221 in words is "one billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".