1233120221 has 4 divisors (see below), whose sum is σ = 1234762944. Its totient is φ = 1231477500.

The previous prime is 1233120199. The next prime is 1233120241. The reversal of 1233120221 is 1220213321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220213321 = 269 ⋅4536109.

It is a cyclic number.

It is not a de Polignac number, because 1233120221 - 2²² = 1228925917 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 1233120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233120241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820235 + ... + 821736.

It is an arithmetic number, because the mean of its divisors is an integer number (308690736).

Almost surely, 2^1233120221 is an apocalyptic number.

It is an amenable number.

1233120221 is a deficient number, since it is larger than the sum of its proper divisors (1642723).

1233120221 is an equidigital number, since it uses as much as digits as its factorization.

1233120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642722.

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

The square root of 1233120221 is about 35115.8115526325. The cubic root of 1233120221 is about 1072.3465029191.

Adding to 1233120221 its reverse (1220213321), we get a palindrome (2453333542).

The spelling of 1233120221 in words is "one billion, two hundred thirty-three million, one hundred twenty thousand, two hundred twenty-one".