201121212001 has 4 divisors (see below), whose sum is σ = 201128139972. Its totient is φ = 201114284032.

The previous prime is 201121211987. The next prime is 201121212013. The reversal of 201121212001 is 100212121102.

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 12612413025 + 188508798976 = 112305^2 + 434176^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121212001 - 2⁵ = 201121211969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121213001) 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, 3420256 + ... + 3478561.

It is an arithmetic number, because the mean of its divisors is an integer number (50282034993).

Almost surely, 2^201121212001 is an apocalyptic number.

It is an amenable number.

201121212001 is a deficient number, since it is larger than the sum of its proper divisors (6927971).

201121212001 is an equidigital number, since it uses as much as digits as its factorization.

201121212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6927970.

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

Adding to 201121212001 its reverse (100212121102), we get a palindrome (301333333103).

The spelling of 201121212001 in words is "two hundred one billion, one hundred twenty-one million, two hundred twelve thousand, one".