1245331221 has 8 divisors (see below), whose sum is σ = 1660620384. Its totient is φ = 830131440.

The previous prime is 1245331201. The next prime is 1245331319. The reversal of 1245331221 is 1221335421.

1245331221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1245331221 - 2¹⁰ = 1245330197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1245331191 and 1245331200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245331201) 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, 23755 + ... + 55271.

It is an arithmetic number, because the mean of its divisors is an integer number (207577548).

Almost surely, 2^1245331221 is an apocalyptic number.

It is an amenable number.

1245331221 is a deficient number, since it is larger than the sum of its proper divisors (415289163).

1245331221 is a wasteful number, since it uses less digits than its factorization.

1245331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44691.

The product of its digits is 1440, while the sum is 24.

The square root of 1245331221 is about 35289.2507854729. The cubic root of 1245331221 is about 1075.8745278830.

Adding to 1245331221 its reverse (1221335421), we get a palindrome (2466666642).

The spelling of 1245331221 in words is "one billion, two hundred forty-five million, three hundred thirty-one thousand, two hundred twenty-one".