1011223221 has 32 divisors (see below), whose sum is σ = 1447649280. Its totient is φ = 626313600.

The previous prime is 1011223219. The next prime is 1011223247. The reversal of 1011223221 is 1223221101.

It is not a de Polignac number, because 1011223221 - 2¹ = 1011223219 is a prime.

It is a super-2 number, since 2×1011223221² = 2045144805379229682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011223201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 766000 + ... + 767318.

It is an arithmetic number, because the mean of its divisors is an integer number (45239040).

Almost surely, 2^1011223221 is an apocalyptic number.

It is an amenable number.

1011223221 is a deficient number, since it is larger than the sum of its proper divisors (436426059).

1011223221 is a wasteful number, since it uses less digits than its factorization.

1011223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657.

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

The square root of 1011223221 is about 31799.7361781509. The cubic root of 1011223221 is about 1003.7271646514.

Adding to 1011223221 its reverse (1223221101), we get a palindrome (2234444322).

It can be divided in two parts, 10112 and 23221, that added together give a palindrome (33333).

The spelling of 1011223221 in words is "one billion, eleven million, two hundred twenty-three thousand, two hundred twenty-one".