2121121001 has 4 divisors (see below), whose sum is σ = 2121736272. Its totient is φ = 2120505732.

The previous prime is 2121120997. The next prime is 2121121049. The reversal of 2121121001 is 1001211212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121121001 - 2² = 2121120997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121121061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302435 + ... + 309368.

It is an arithmetic number, because the mean of its divisors is an integer number (530434068).

Almost surely, 2^2121121001 is an apocalyptic number.

It is an amenable number.

2121121001 is a deficient number, since it is larger than the sum of its proper divisors (615271).

2121121001 is an equidigital number, since it uses as much as digits as its factorization.

2121121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615270.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2121121001 is about 46055.6294170430. The cubic root of 2121121001 is about 1284.8580444456.

Adding to 2121121001 its reverse (1001211212), we get a palindrome (3122332213).

The spelling of 2121121001 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, one".