1221131223 has 24 divisors (see below), whose sum is σ = 1916368272. Its totient is φ = 744807168.

The previous prime is 1221131189. The next prime is 1221131321. The reversal of 1221131223 is 3221311221.

It is not a de Polignac number, because 1221131223 - 2⁹ = 1221130711 is a prime.

It is a super-2 number, since 2×1221131223² = 2982322927570951458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221131196 and 1221131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32961 + ... + 59402.

It is an arithmetic number, because the mean of its divisors is an integer number (79848678).

Almost surely, 2^1221131223 is an apocalyptic number.

1221131223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221131223 is a deficient number, since it is larger than the sum of its proper divisors (695237049).

1221131223 is a wasteful number, since it uses less digits than its factorization.

1221131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92495 (or 92492 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1221131223 is about 34944.6880512618. The cubic root of 1221131223 is about 1068.8598864340.

Adding to 1221131223 its reverse (3221311221), we get a palindrome (4442442444).

It can be divided in two parts, 12211 and 31223, that added together give a palindrome (43434).

The spelling of 1221131223 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-three".