201221102001 has 8 divisors (see below), whose sum is σ = 268324087680. Its totient is φ = 134132758832.

The previous prime is 201221101951. The next prime is 201221102009. The reversal of 201221102001 is 100201122102.

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 201221102001 - 2²³ = 201212713393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221102009) 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, 3628521 + ... + 3683558.

It is an arithmetic number, because the mean of its divisors is an integer number (33540510960).

Almost surely, 2^201221102001 is an apocalyptic number.

It is an amenable number.

201221102001 is a deficient number, since it is larger than the sum of its proper divisors (67102985679).

201221102001 is an equidigital number, since it uses as much as digits as its factorization.

201221102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7321255.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201221102001 its reverse (100201122102), we get a palindrome (301422224103).

The spelling of 201221102001 in words is "two hundred one billion, two hundred twenty-one million, one hundred two thousand, one".