1331002221 has 8 divisors (see below), whose sum is σ = 1822633824. Its totient is φ = 863352720.

The previous prime is 1331002213. The next prime is 1331002223. The reversal of 1331002221 is 1222001331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1331002221 - 2³ = 1331002213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331002223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5995395 + ... + 5995616.

It is an arithmetic number, because the mean of its divisors is an integer number (227829228).

Almost surely, 2^1331002221 is an apocalyptic number.

It is an amenable number.

1331002221 is a deficient number, since it is larger than the sum of its proper divisors (491631603).

1331002221 is a wasteful number, since it uses less digits than its factorization.

1331002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11991051.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331002221 is about 36482.9031328374. The cubic root of 1331002221 is about 1100.0006118454. Note that the first 3 decimals are identical.

Adding to 1331002221 its reverse (1222001331), we get a palindrome (2553003552).

The spelling of 1331002221 in words is "one billion, three hundred thirty-one million, two thousand, two hundred twenty-one".