210001002121 has 4 divisors (see below), whose sum is σ = 213560341200. Its totient is φ = 206441663044.

The previous prime is 210001002109. The next prime is 210001002131. The reversal of 210001002121 is 121200100012.

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 210001002121 - 2¹⁷ = 210000871049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210001002098 and 210001002107.

It is not an unprimeable number, because it can be changed into a prime (210001002131) 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, 1779669451 + ... + 1779669568.

It is an arithmetic number, because the mean of its divisors is an integer number (53390085300).

Almost surely, 2^210001002121 is an apocalyptic number.

It is an amenable number.

210001002121 is a deficient number, since it is larger than the sum of its proper divisors (3559339079).

210001002121 is an equidigital number, since it uses as much as digits as its factorization.

210001002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559339078.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210001002121 its reverse (121200100012), we get a palindrome (331201102133).

The spelling of 210001002121 in words is "two hundred ten billion, one million, two thousand, one hundred twenty-one".