1101221001 has 10 divisors (see below), whose sum is σ = 1645033962. Its totient is φ = 734147280.

The previous prime is 1101220999. The next prime is 1101221003. The reversal of 1101221001 is 1001221011.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1101220999) and next prime (1101221003).

It can be written as a sum of positive squares in only one way, i.e., 1012766976 + 88454025 = 31824^2 + 9405^2 .

It is not a de Polignac number, because 1101221001 - 2¹ = 1101220999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

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 9 ways as a sum of consecutive naturals, for example, 6797580 + ... + 6797741.

Almost surely, 2^1101221001 is an apocalyptic number.

It is an amenable number.

1101221001 is a deficient number, since it is larger than the sum of its proper divisors (543812961).

1101221001 is an equidigital number, since it uses as much as digits as its factorization.

1101221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595333 (or 13595324 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1101221001 is about 33184.6500810239. The cubic root of 1101221001 is about 1032.6619181796.

Adding to 1101221001 its reverse (1001221011), we get a palindrome (2102442012).

The spelling of 1101221001 in words is "one billion, one hundred one million, two hundred twenty-one thousand, one".