2121100001 has 4 divisors (see below), whose sum is σ = 2170427952. Its totient is φ = 2071772052.

The previous prime is 2121099983. The next prime is 2121100019. The reversal of 2121100001 is 1000011212.

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 an interprime number because it is at equal distance from previous prime (2121099983) and next prime (2121100019).

It is a cyclic number.

It is not a de Polignac number, because 2121100001 - 2¹⁰ = 2121098977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121100021) 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 3 ways as a sum of consecutive naturals, for example, 24663911 + ... + 24663996.

It is an arithmetic number, because the mean of its divisors is an integer number (542606988).

Almost surely, 2^2121100001 is an apocalyptic number.

It is an amenable number.

2121100001 is a deficient number, since it is larger than the sum of its proper divisors (49327951).

2121100001 is an equidigital number, since it uses as much as digits as its factorization.

2121100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49327950.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2121100001 is about 46055.4014313196. The cubic root of 2121100001 is about 1284.8538042180.

Adding to 2121100001 its reverse (1000011212), we get a palindrome (3121111213).

The spelling of 2121100001 in words is "two billion, one hundred twenty-one million, one hundred thousand, one".