1101821 has 16 divisors (see below), whose sum is σ = 1368576. Its totient is φ = 865536.

The previous prime is 1101811. The next prime is 1101839. The reversal of 1101821 is 1281011.

It is not a de Polignac number, because 1101821 - 2¹⁰ = 1100797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101796 and 1101805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5495 + ... + 5691.

It is an arithmetic number, because the mean of its divisors is an integer number (85536).

2^1101821 is an apocalyptic number.

It is an amenable number.

1101821 is a deficient number, since it is larger than the sum of its proper divisors (266755).

1101821 is a wasteful number, since it uses less digits than its factorization.

1101821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1101821 is about 1049.6766168683. The cubic root of 1101821 is about 103.2849432349.

Adding to 1101821 its reverse (1281011), we get a palindrome (2382832).

The spelling of 1101821 in words is "one million, one hundred one thousand, eight hundred twenty-one".