1100421 has 12 divisors (see below), whose sum is σ = 1816672. Its totient is φ = 628776.

The previous prime is 1100419. The next prime is 1100441. The reversal of 1100421 is 1240011.

It is a happy number.

It is not a de Polignac number, because 1100421 - 2¹ = 1100419 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 a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100441) 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, 8671 + ... + 8796.

2^1100421 is an apocalyptic number.

It is an amenable number.

1100421 is a deficient number, since it is larger than the sum of its proper divisors (716251).

1100421 is a wasteful number, since it uses less digits than its factorization.

1100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17480 (or 17477 counting only the distinct ones).

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

The square root of 1100421 is about 1049.0095328452. The cubic root of 1100421 is about 103.2411792577.

Adding to 1100421 its reverse (1240011), we get a palindrome (2340432).

It can be divided in two parts, 11004 and 21, that added together give a square (11025 = 105²).

The spelling of 1100421 in words is "one million, one hundred thousand, four hundred twenty-one".