2121010001 has 4 divisors (see below), whose sum is σ = 2313829104. Its totient is φ = 1928190900.

The previous prime is 2121009983. The next prime is 2121010007. The reversal of 2121010001 is 1000101212.

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 a de Polignac number, because none of the positive numbers 2^k-2121010001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121010007) 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, 96409535 + ... + 96409556.

It is an arithmetic number, because the mean of its divisors is an integer number (578457276).

Almost surely, 2^2121010001 is an apocalyptic number.

It is an amenable number.

2121010001 is a deficient number, since it is larger than the sum of its proper divisors (192819103).

2121010001 is a wasteful number, since it uses less digits than its factorization.

2121010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192819102.

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

The square root of 2121010001 is about 46054.4243368647. The cubic root of 2121010001 is about 1284.8356314966.

Adding to 2121010001 its reverse (1000101212), we get a palindrome (3121111213).

The spelling of 2121010001 in words is "two billion, one hundred twenty-one million, ten thousand, one".