1233121013 has 4 divisors (see below), whose sum is σ = 1234123968. Its totient is φ = 1232118060.

The previous prime is 1233121009. The next prime is 1233121031. The reversal of 1233121013 is 3101213321.

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.

It is a cyclic number.

It is not a de Polignac number, because 1233121013 - 2² = 1233121009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1233120982 and 1233121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233121313) 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, 499631 + ... + 502092.

It is an arithmetic number, because the mean of its divisors is an integer number (308530992).

Almost surely, 2^1233121013 is an apocalyptic number.

It is an amenable number.

1233121013 is a deficient number, since it is larger than the sum of its proper divisors (1002955).

1233121013 is a wasteful number, since it uses less digits than its factorization.

1233121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002954.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1233121013 is about 35115.8228296020. The cubic root of 1233121013 is about 1072.3467324988.

Adding to 1233121013 its reverse (3101213321), we get a palindrome (4334334334).

The spelling of 1233121013 in words is "one billion, two hundred thirty-three million, one hundred twenty-one thousand, thirteen".