1101221 has 12 divisors (see below), whose sum is σ = 1276800. Its totient is φ = 946440.

The previous prime is 1101211. The next prime is 1101229. The reversal of 1101221 is 1221011.

It is a de Polignac number, because none of the positive numbers 2^k-1101221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101199 and 1101208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101229) 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, 2060 + ... + 2538.

It is an arithmetic number, because the mean of its divisors is an integer number (106400).

2^1101221 is an apocalyptic number.

1101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101221 is a deficient number, since it is larger than the sum of its proper divisors (175579).

1101221 is a wasteful number, since it uses less digits than its factorization.

1101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1101221 is about 1049.3907756408. The cubic root of 1101221 is about 103.2661917867.

Adding to 1101221 its reverse (1221011), we get a palindrome (2322232).

It can be divided in two parts, 110 and 1221, that added together give a palindrome (1331).

The spelling of 1101221 in words is "one million, one hundred one thousand, two hundred twenty-one".