210212121001 has 4 divisors (see below), whose sum is σ = 210220320772. Its totient is φ = 210203921232.

The previous prime is 210212120971. The next prime is 210212121047. The reversal of 210212121001 is 100121212012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172847231001 + 37364890000 = 415749^2 + 193300^2 .

It is a cyclic number.

It is not a de Polignac number, because 210212121001 - 2⁵ = 210212120969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210212121401) 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, 4061310 + ... + 4112743.

It is an arithmetic number, because the mean of its divisors is an integer number (52555080193).

Almost surely, 2^210212121001 is an apocalyptic number.

It is an amenable number.

210212121001 is a deficient number, since it is larger than the sum of its proper divisors (8199771).

210212121001 is an equidigital number, since it uses as much as digits as its factorization.

210212121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8199770.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210212121001 its reverse (100121212012), we get a palindrome (310333333013).

The spelling of 210212121001 in words is "two hundred ten billion, two hundred twelve million, one hundred twenty-one thousand, one".