121101001 has 6 divisors (see below), whose sum is σ = 140872650. Its totient is φ = 103800816.

The previous prime is 121100939. The next prime is 121101011. The reversal of 121101001 is 100101121.

It can be written as a sum of positive squares in only one way, i.e., 86936976 + 34164025 = 9324^2 + 5845^2 .

It is not a de Polignac number, because 121101001 - 2⁹ = 121100489 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1235676 + ... + 1235773.

It is an arithmetic number, because the mean of its divisors is an integer number (23478775).

Almost surely, 2^121101001 is an apocalyptic number.

It is an amenable number.

121101001 is a deficient number, since it is larger than the sum of its proper divisors (19771649).

121101001 is an equidigital number, since it uses as much as digits as its factorization.

121101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471463 (or 2471456 counting only the distinct ones).

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

The square root of 121101001 is about 11004.5899969058. The cubic root of 121101001 is about 494.7463258249.

Adding to 121101001 its reverse (100101121), we get a palindrome (221202122).

The spelling of 121101001 in words is "one hundred twenty-one million, one hundred one thousand, one".