1109890221 has 32 divisors (see below), whose sum is σ = 1663145088. Its totient is φ = 652458240.

The previous prime is 1109890219. The next prime is 1109890259. The reversal of 1109890221 is 1220989011.

It is not a de Polignac number, because 1109890221 - 2¹ = 1109890219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109890261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454215 + ... + 456651.

It is an arithmetic number, because the mean of its divisors is an integer number (51973284).

Almost surely, 2^1109890221 is an apocalyptic number.

1109890221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1109890221 is a deficient number, since it is larger than the sum of its proper divisors (553254867).

1109890221 is a wasteful number, since it uses less digits than its factorization.

1109890221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 1109890221 is about 33315.0149482182. The cubic root of 1109890221 is about 1035.3646706758.

It can be divided in two parts, 1109890 and 221, that added together give a palindrome (1110111).

The spelling of 1109890221 in words is "one billion, one hundred nine million, eight hundred ninety thousand, two hundred twenty-one".