1213521233 has 2 divisors, whose sum is σ = 1213521234. Its totient is φ = 1213521232.

The previous prime is 1213521173. The next prime is 1213521259. The reversal of 1213521233 is 3321253121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213268224 + 253009 = 34832^2 + 503^2 .

It is an emirp because it is prime and its reverse (3321253121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213521233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213521199 and 1213521208.

It is not a weakly prime, because it can be changed into another prime (1213521293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606760616 + 606760617.

It is an arithmetic number, because the mean of its divisors is an integer number (606760617).

Almost surely, 2^1213521233 is an apocalyptic number.

It is an amenable number.

1213521233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213521233 is an equidigital number, since it uses as much as digits as its factorization.

1213521233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 1213521233 is about 34835.6316578299. The cubic root of 1213521233 is about 1066.6349088961.

Adding to 1213521233 its reverse (3321253121), we get a palindrome (4534774354).

The spelling of 1213521233 in words is "one billion, two hundred thirteen million, five hundred twenty-one thousand, two hundred thirty-three".