201221000011 has 4 divisors (see below), whose sum is σ = 201312341752. Its totient is φ = 201129658272.

The previous prime is 201220999997. The next prime is 201221000023. The reversal of 201221000011 is 110000122102.

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

It is a cyclic number.

It is not a de Polignac number, because 201221000011 - 2⁵ = 201220999979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221000051) 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, 45667566 + ... + 45671971.

It is an arithmetic number, because the mean of its divisors is an integer number (50328085438).

Almost surely, 2^201221000011 is an apocalyptic number.

201221000011 is a deficient number, since it is larger than the sum of its proper divisors (91341741).

201221000011 is an equidigital number, since it uses as much as digits as its factorization.

201221000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91341740.

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

Adding to 201221000011 its reverse (110000122102), we get a palindrome (311221122113).

The spelling of 201221000011 in words is "two hundred one billion, two hundred twenty-one million, eleven", and thus it is an aban number.