1201220221101 has 4 divisors (see below), whose sum is σ = 1601626961472. Its totient is φ = 800813480732.

The previous prime is 1201220221063. The next prime is 1201220221141. The reversal of 1201220221101 is 1011220221021.

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 1201220221101 - 2⁶ = 1201220221037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220221141) 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, 200203370181 + ... + 200203370186.

It is an arithmetic number, because the mean of its divisors is an integer number (400406740368).

Almost surely, 2^{1201220221101} is an apocalyptic number.

It is an amenable number.

1201220221101 is a deficient number, since it is larger than the sum of its proper divisors (400406740371).

1201220221101 is an equidigital number, since it uses as much as digits as its factorization.

1201220221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400406740370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201220221101 its reverse (1011220221021), we get a palindrome (2212440442122).

The spelling of 1201220221101 in words is "one trillion, two hundred one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred one".