1233131221 has 8 divisors (see below), whose sum is σ = 1423822400. Its totient is φ = 1046072448.

The previous prime is 1233131213. The next prime is 1233131309. The reversal of 1233131221 is 1221313321.

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

It is a cyclic number.

It is not a de Polignac number, because 1233131221 - 2³ = 1233131213 is a prime.

It is a super-2 number, since 2×1233131221² = 3041225216409901682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233131201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907371 + ... + 908728.

It is an arithmetic number, because the mean of its divisors is an integer number (177977800).

Almost surely, 2^1233131221 is an apocalyptic number.

It is an amenable number.

1233131221 is a deficient number, since it is larger than the sum of its proper divisors (190691179).

1233131221 is an equidigital number, since it uses as much as digits as its factorization.

1233131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816203.

The product of its digits is 216, while the sum is 19.

The square root of 1233131221 is about 35115.9681768850. The cubic root of 1233131221 is about 1072.3496915177.

Adding to 1233131221 its reverse (1221313321), we get a palindrome (2454444542).

The spelling of 1233131221 in words is "one billion, two hundred thirty-three million, one hundred thirty-one thousand, two hundred twenty-one".