201201220001 has 4 divisors (see below), whose sum is σ = 201205815552. Its totient is φ = 201196624452.

The previous prime is 201201219997. The next prime is 201201220027. The reversal of 201201220001 is 100022102102.

It is a happy number.

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 201201220001 - 2² = 201201219997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201201220301) 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, 2231465 + ... + 2319878.

It is an arithmetic number, because the mean of its divisors is an integer number (50301453888).

Almost surely, 2^201201220001 is an apocalyptic number.

It is an amenable number.

201201220001 is a deficient number, since it is larger than the sum of its proper divisors (4595551).

201201220001 is an equidigital number, since it uses as much as digits as its factorization.

201201220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595550.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201201220001 its reverse (100022102102), we get a palindrome (301223322103).

The spelling of 201201220001 in words is "two hundred one billion, two hundred one million, two hundred twenty thousand, one".