1101221009 has 16 divisors (see below), whose sum is σ = 1304795520. Its totient is φ = 909767040.

The previous prime is 1101221003. The next prime is 1101221021. The reversal of 1101221009 is 9001221011.

It is not a de Polignac number, because 1101221009 - 2⁴ = 1101220993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1101221003) 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, 707 + ... + 46935.

It is an arithmetic number, because the mean of its divisors is an integer number (81549720).

Almost surely, 2^1101221009 is an apocalyptic number.

It is an amenable number.

1101221009 is a deficient number, since it is larger than the sum of its proper divisors (203574511).

1101221009 is an equidigital number, since it uses as much as digits as its factorization.

1101221009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46360.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1101221009 is about 33184.6502015616. The cubic root of 1101221009 is about 1032.6619206802.

The spelling of 1101221009 in words is "one billion, one hundred one million, two hundred twenty-one thousand, nine".