1001120121 has 8 divisors (see below), whose sum is σ = 1483140960. Its totient is φ = 667413396.

The previous prime is 1001120119. The next prime is 1001120129. The reversal of 1001120121 is 1210211001.

It is a happy number.

It is not a de Polignac number, because 1001120121 - 2¹ = 1001120119 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 (1001120129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18539235 + ... + 18539288.

It is an arithmetic number, because the mean of its divisors is an integer number (185392620).

Almost surely, 2^1001120121 is an apocalyptic number.

It is an amenable number.

1001120121 is a deficient number, since it is larger than the sum of its proper divisors (482020839).

1001120121 is an equidigital number, since it uses as much as digits as its factorization.

1001120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37078532 (or 37078526 counting only the distinct ones).

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

The square root of 1001120121 is about 31640.4823130116. The cubic root of 1001120121 is about 1000.3732343455.

Adding to 1001120121 its reverse (1210211001), we get a palindrome (2211331122).

The spelling of 1001120121 in words is "one billion, one million, one hundred twenty thousand, one hundred twenty-one".