20121210001 has 8 divisors (see below), whose sum is σ = 20342635200. Its totient is φ = 19900220400.

The previous prime is 20121209993. The next prime is 20121210017. The reversal of 20121210001 is 10001212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121210001 - 2³ = 20121209993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121210001.

It is not an unprimeable number, because it can be changed into a prime (20121210401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15571 + ... + 201208.

It is an arithmetic number, because the mean of its divisors is an integer number (2542829400).

Almost surely, 2^20121210001 is an apocalyptic number.

It is an amenable number.

20121210001 is a deficient number, since it is larger than the sum of its proper divisors (221425199).

20121210001 is a wasteful number, since it uses less digits than its factorization.

20121210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217799.

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

Adding to 20121210001 its reverse (10001212102), we get a palindrome (30122422103).

The spelling of 20121210001 in words is "twenty billion, one hundred twenty-one million, two hundred ten thousand, one".