1201331301221 has 4 divisors (see below), whose sum is σ = 1201357649772. Its totient is φ = 1201304952672.

The previous prime is 1201331301167. The next prime is 1201331301223. The reversal of 1201331301221 is 1221031331021.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1079491908196 + 121839393025 = 1038986^2 + 349055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201331301221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201331301193 and 1201331301202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201331301223) 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, 13105766 + ... + 13197111.

It is an arithmetic number, because the mean of its divisors is an integer number (300339412443).

Almost surely, 2^{1201331301221} is an apocalyptic number.

It is an amenable number.

1201331301221 is a deficient number, since it is larger than the sum of its proper divisors (26348551).

1201331301221 is an equidigital number, since it uses as much as digits as its factorization.

1201331301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26348550.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1201331301221 its reverse (1221031331021), we get a palindrome (2422362632242).

The spelling of 1201331301221 in words is "one trillion, two hundred one billion, three hundred thirty-one million, three hundred one thousand, two hundred twenty-one".