1231023221 has 8 divisors (see below), whose sum is σ = 1260230400. Its totient is φ = 1201842432.

The previous prime is 1231023187. The next prime is 1231023223. The reversal of 1231023221 is 1223201321.

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

It is not a de Polignac number, because 1231023221 - 2²⁶ = 1163914357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231023223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113180 + ... + 123578.

It is an arithmetic number, because the mean of its divisors is an integer number (157528800).

Almost surely, 2^1231023221 is an apocalyptic number.

It is an amenable number.

1231023221 is a deficient number, since it is larger than the sum of its proper divisors (29207179).

1231023221 is a wasteful number, since it uses less digits than its factorization.

1231023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13195.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231023221 is about 35085.9405032842. The cubic root of 1231023221 is about 1071.7382933609.

Adding to 1231023221 its reverse (1223201321), we get a palindrome (2454224542).

The spelling of 1231023221 in words is "one billion, two hundred thirty-one million, twenty-three thousand, two hundred twenty-one".