1100121001 has 6 divisors (see below), whose sum is σ = 1279732650. Its totient is φ = 942960816.

The previous prime is 1100120999. The next prime is 1100121007. The reversal of 1100121001 is 1001210011.

It can be written as a sum of positive squares in only one way, i.e., 963792025 + 136328976 = 31045^2 + 11676^2 .

It is not a de Polignac number, because 1100121001 - 2¹ = 1100120999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (1100121007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11225676 + ... + 11225773.

It is an arithmetic number, because the mean of its divisors is an integer number (213288775).

Almost surely, 2^1100121001 is an apocalyptic number.

It is an amenable number.

1100121001 is a deficient number, since it is larger than the sum of its proper divisors (179611649).

1100121001 is an equidigital number, since it uses as much as digits as its factorization.

1100121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22451463 (or 22451456 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1100121001 is about 33168.0720121022. The cubic root of 1100121001 is about 1032.3179646523.

Adding to 1100121001 its reverse (1001210011), we get a palindrome (2101331012).

The spelling of 1100121001 in words is "one billion, one hundred million, one hundred twenty-one thousand, one".