121121001 has 10 divisors (see below), whose sum is σ = 180933962. Its totient is φ = 80747280.

The previous prime is 121120969. The next prime is 121121003. The reversal of 121121001 is 100121121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 95355225 + 25765776 = 9765^2 + 5076^2 .

It is not a de Polignac number, because 121121001 - 2⁵ = 121120969 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 747580 + ... + 747741.

Almost surely, 2^121121001 is an apocalyptic number.

It is an amenable number.

121121001 is a deficient number, since it is larger than the sum of its proper divisors (59812961).

121121001 is an equidigital number, since it uses as much as digits as its factorization.

121121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495333 (or 1495324 counting only the distinct ones).

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

The square root of 121121001 is about 11005.4986711189. The cubic root of 121121001 is about 494.7735603419.

Adding to 121121001 its reverse (100121121), we get a palindrome (221242122).

The spelling of 121121001 in words is "one hundred twenty-one million, one hundred twenty-one thousand, one".