1100020401 has 12 divisors (see below), whose sum is σ = 1589206528. Its totient is φ = 733213944.

The previous prime is 1100020357. The next prime is 1100020417. The reversal of 1100020401 is 1040200011.

It is a happy number.

It is not a de Polignac number, because 1100020401 - 2⁹ = 1100019889 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100000401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86796 + ... + 98658.

Almost surely, 2^1100020401 is an apocalyptic number.

It is an amenable number.

1100020401 is a deficient number, since it is larger than the sum of its proper divisors (489186127).

1100020401 is a wasteful number, since it uses less digits than its factorization.

1100020401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22172 (or 22169 counting only the distinct ones).

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

The square root of 1100020401 is about 33166.5554587750. Note that the first 3 decimals coincide. The cubic root of 1100020401 is about 1032.2864970977.

Adding to 1100020401 its reverse (1040200011), we get a palindrome (2140220412).

The spelling of 1100020401 in words is "one billion, one hundred million, twenty thousand, four hundred one".