1233125621 has 24 divisors (see below), whose sum is σ = 1548056160. Its totient is φ = 973600992.

The previous prime is 1233125599. The next prime is 1233125627. The reversal of 1233125621 is 1265213321.

It is a happy number.

It is not a de Polignac number, because 1233125621 - 2⁶ = 1233125557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233125627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346670 + ... + 350208.

It is an arithmetic number, because the mean of its divisors is an integer number (64502340).

Almost surely, 2^1233125621 is an apocalyptic number.

It is an amenable number.

1233125621 is a deficient number, since it is larger than the sum of its proper divisors (314930539).

1233125621 is a wasteful number, since it uses less digits than its factorization.

1233125621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113 (or 4106 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 1233125621 is about 35115.8884409892. Note that the first 3 decimals coincide. The cubic root of 1233125621 is about 1072.3480682335.

Adding to 1233125621 its reverse (1265213321), we get a palindrome (2498338942).

The spelling of 1233125621 in words is "one billion, two hundred thirty-three million, one hundred twenty-five thousand, six hundred twenty-one".