1232111221 has 16 divisors (see below), whose sum is σ = 1428897600. Its totient is φ = 1050624000.

The previous prime is 1232111161. The next prime is 1232111233. The reversal of 1232111221 is 1221112321.

It is not a de Polignac number, because 1232111221 - 2⁹ = 1232110709 is a prime.

It is a super-2 number, since 2×1232111221² = 3036196121828221682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1232111195 and 1232111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232111021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8076 + ... + 50293.

It is an arithmetic number, because the mean of its divisors is an integer number (89306100).

Almost surely, 2^1232111221 is an apocalyptic number.

1232111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1232111221 is a deficient number, since it is larger than the sum of its proper divisors (196786379).

1232111221 is a wasteful number, since it uses less digits than its factorization.

1232111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58500.

The product of its digits is 48, while the sum is 16.

The square root of 1232111221 is about 35101.4418649719. The cubic root of 1232111221 is about 1072.0539407796.

Adding to 1232111221 its reverse (1221112321), we get a palindrome (2453223542).

The spelling of 1232111221 in words is "one billion, two hundred thirty-two million, one hundred eleven thousand, two hundred twenty-one".