1011220221 has 8 divisors (see below), whose sum is σ = 1470865824. Its totient is φ = 612860720.

The previous prime is 1011220193. The next prime is 1011220229. The reversal of 1011220221 is 1220221101.

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 1011220221 - 2⁶ = 1011220157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011220197 and 1011220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011220229) 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, 15321486 + ... + 15321551.

It is an arithmetic number, because the mean of its divisors is an integer number (183858228).

Almost surely, 2^1011220221 is an apocalyptic number.

1011220221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011220221 is a deficient number, since it is larger than the sum of its proper divisors (459645603).

1011220221 is a wasteful number, since it uses less digits than its factorization.

1011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30643051.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1011220221 is about 31799.6890079133. The cubic root of 1011220221 is about 1003.7261720633.

Adding to 1011220221 its reverse (1220221101), we get a palindrome (2231441322).

It can be divided in two parts, 101 and 1220221, that multiplied together give a palindrome (123242321).

The spelling of 1011220221 in words is "one billion, eleven million, two hundred twenty thousand, two hundred twenty-one".