1230513021 has 12 divisors (see below), whose sum is σ = 1797379740. Its totient is φ = 811124160.

The previous prime is 1230512993. The next prime is 1230513029. The reversal of 1230513021 is 1203150321.

It can be written as a sum of positive squares in 2 ways, for example, as 542237796 + 688275225 = 23286^2 + 26235^2 .

It is not a de Polignac number, because 1230513021 - 2⁹ = 1230512509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1230512985 and 1230513003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230513029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 767310 + ... + 768911.

It is an arithmetic number, because the mean of its divisors is an integer number (149781645).

Almost surely, 2^1230513021 is an apocalyptic number.

It is an amenable number.

1230513021 is a deficient number, since it is larger than the sum of its proper divisors (566866719).

1230513021 is a wasteful number, since it uses less digits than its factorization.

1230513021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536316 (or 1536313 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1230513021 is about 35078.6690311933. The cubic root of 1230513021 is about 1071.5902115521.

Adding to 1230513021 its reverse (1203150321), we get a palindrome (2433663342).

The spelling of 1230513021 in words is "one billion, two hundred thirty million, five hundred thirteen thousand, twenty-one".