1233312221 has 2 divisors, whose sum is σ = 1233312222. Its totient is φ = 1233312220.

The previous prime is 1233312217. The next prime is 1233312229. The reversal of 1233312221 is 1222133321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232992996 + 319225 = 35114^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1233312221 - 2² = 1233312217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1233312193 and 1233312202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1233312229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616656110 + 616656111.

It is an arithmetic number, because the mean of its divisors is an integer number (616656111).

Almost surely, 2^1233312221 is an apocalyptic number.

It is an amenable number.

1233312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233312221 is an equidigital number, since it uses as much as digits as its factorization.

1233312221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 1233312221 is about 35118.5452574562. The cubic root of 1233312221 is about 1072.4021557365.

Adding to 1233312221 its reverse (1222133321), we get a palindrome (2455445542).

The spelling of 1233312221 in words is "one billion, two hundred thirty-three million, three hundred twelve thousand, two hundred twenty-one".