1231102221 has 8 divisors (see below), whose sum is σ = 1685833824. Its totient is φ = 798552720.

The previous prime is 1231102189. The next prime is 1231102253. The reversal of 1231102221 is 1222011321.

It is an interprime number because it is at equal distance from previous prime (1231102189) and next prime (1231102253).

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

It is not a de Polignac number, because 1231102221 - 2⁵ = 1231102189 is a prime.

It is a super-2 number, since 2×1231102221² = 3031225357102265682, 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 1231102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231102291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5545395 + ... + 5545616.

It is an arithmetic number, because the mean of its divisors is an integer number (210729228).

Almost surely, 2^1231102221 is an apocalyptic number.

It is an amenable number.

1231102221 is a deficient number, since it is larger than the sum of its proper divisors (454731603).

1231102221 is a wasteful number, since it uses less digits than its factorization.

1231102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091051.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231102221 is about 35087.0662922964. The cubic root of 1231102221 is about 1071.7612188732.

Adding to 1231102221 its reverse (1222011321), we get a palindrome (2453113542).

The spelling of 1231102221 in words is "one billion, two hundred thirty-one million, one hundred two thousand, two hundred twenty-one".