1231003221 has 32 divisors (see below), whose sum is σ = 1905527808. Its totient is φ = 692375040.

The previous prime is 1231003187. The next prime is 1231003243. The reversal of 1231003221 is 1223001321.

It is not a de Polignac number, because 1231003221 - 2¹⁸ = 1230741077 is a prime.

It is a super-2 number, since 2×1231003221² = 3030737860224749682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231003221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231013221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 364581 + ... + 367941.

It is an arithmetic number, because the mean of its divisors is an integer number (59547744).

Almost surely, 2^1231003221 is an apocalyptic number.

It is an amenable number.

1231003221 is a deficient number, since it is larger than the sum of its proper divisors (674524587).

1231003221 is a wasteful number, since it uses less digits than its factorization.

1231003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641.

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

The square root of 1231003221 is about 35085.6554876776. The cubic root of 1231003221 is about 1071.7324892781.

Adding to 1231003221 its reverse (1223001321), we get a palindrome (2454004542).

The spelling of 1231003221 in words is "one billion, two hundred thirty-one million, three thousand, two hundred twenty-one".