1100022021 has 18 divisors (see below), whose sum is σ = 1848337062. Its totient is φ = 628583760.

The previous prime is 1100021999. The next prime is 1100022029. The reversal of 1100022021 is 1202200011.

It can be written as a sum of positive squares in only one way, i.e., 1081488996 + 18533025 = 32886^2 + 4305^2 .

It is not a de Polignac number, because 1100022021 - 2¹⁷ = 1099890949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1100021994 and 1100022012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100022029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1246750 + ... + 1247631.

Almost surely, 2^1100022021 is an apocalyptic number.

It is an amenable number.

1100022021 is a deficient number, since it is larger than the sum of its proper divisors (748315041).

1100022021 is a wasteful number, since it uses less digits than its factorization.

1100022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494401 (or 2494391 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1100022021 is about 33166.5798809585. The cubic root of 1100022021 is about 1032.2870038469.

Adding to 1100022021 its reverse (1202200011), we get a palindrome (2302222032).

The spelling of 1100022021 in words is "one billion, one hundred million, twenty-two thousand, twenty-one".