1331332100221 has 4 divisors (see below), whose sum is σ = 1341815030272. Its totient is φ = 1320849170172.

The previous prime is 1331332100207. The next prime is 1331332100233. The reversal of 1331332100221 is 1220012331331.

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 a de Polignac number, because none of the positive numbers 2^k-1331332100221 is a prime.

It is a super-2 number, since 2×1331332100221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331332100192 and 1331332100201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331332100291) 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, 5241464835 + ... + 5241465088.

It is an arithmetic number, because the mean of its divisors is an integer number (335453757568).

Almost surely, 2^{1331332100221} is an apocalyptic number.

It is an amenable number.

1331332100221 is a deficient number, since it is larger than the sum of its proper divisors (10482930051).

1331332100221 is a wasteful number, since it uses less digits than its factorization.

1331332100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482930050.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1331332100221 its reverse (1220012331331), we get a palindrome (2551344431552).

The spelling of 1331332100221 in words is "one trillion, three hundred thirty-one billion, three hundred thirty-two million, one hundred thousand, two hundred twenty-one".