1209010121 has 8 divisors (see below), whose sum is σ = 1334811744. Its totient is φ = 1085857120.

The previous prime is 1209010073. The next prime is 1209010151. The reversal of 1209010121 is 1210109021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209010121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209010121.

It is not an unprimeable number, because it can be changed into a prime (1209010151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661196 + ... + 663021.

It is an arithmetic number, because the mean of its divisors is an integer number (166851468).

Almost surely, 2^1209010121 is an apocalyptic number.

1209010121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1209010121 is a deficient number, since it is larger than the sum of its proper divisors (125801623).

1209010121 is a wasteful number, since it uses less digits than its factorization.

1209010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324311.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1209010121 is about 34770.8228404218. The cubic root of 1209010121 is about 1065.3115742185.

Adding to 1209010121 its reverse (1210109021), we get a palindrome (2419119142).

The spelling of 1209010121 in words is "one billion, two hundred nine million, ten thousand, one hundred twenty-one".