1221100000201 has 4 divisors (see below), whose sum is σ = 1221503939712. Its totient is φ = 1220696060692.

The previous prime is 1221100000193. The next prime is 1221100000217. The reversal of 1221100000201 is 1020000011221.

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 1221100000201 - 2³ = 1221100000193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221100000271) 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, 201965221 + ... + 201971266.

It is an arithmetic number, because the mean of its divisors is an integer number (305375984928).

Almost surely, 2^{1221100000201} is an apocalyptic number.

It is an amenable number.

1221100000201 is a deficient number, since it is larger than the sum of its proper divisors (403939511).

1221100000201 is an equidigital number, since it uses as much as digits as its factorization.

1221100000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403939510.

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

Adding to 1221100000201 its reverse (1020000011221), we get a palindrome (2241100011422).

The spelling of 1221100000201 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred one", and thus it is an aban number.