1100520221 has 4 divisors (see below), whose sum is σ = 1110259452. Its totient is φ = 1090780992.

The previous prime is 1100520173. The next prime is 1100520227. The reversal of 1100520221 is 1220250011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 423948100 + 676572121 = 20590^2 + 26011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100520221 - 2¹⁸ = 1100258077 is a prime.

It is a super-2 number, since 2×1100520221² = 2422289513659777682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100520196 and 1100520205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100520227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4869446 + ... + 4869671.

It is an arithmetic number, because the mean of its divisors is an integer number (277564863).

Almost surely, 2^1100520221 is an apocalyptic number.

It is an amenable number.

1100520221 is a deficient number, since it is larger than the sum of its proper divisors (9739231).

1100520221 is an equidigital number, since it uses as much as digits as its factorization.

1100520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9739230.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1100520221 is about 33174.0896031828. The cubic root of 1100520221 is about 1032.4428212624.

Adding to 1100520221 its reverse (1220250011), we get a palindrome (2320770232).

The spelling of 1100520221 in words is "one billion, one hundred million, five hundred twenty thousand, two hundred twenty-one".