30531021021236 has 6 divisors (see below), whose sum is σ = 53429286787170. Its totient is φ = 15265510510616.

The previous prime is 30531021021233. The next prime is 30531021021247. The reversal of 30531021021236 is 63212012013503.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28225907593636 + 2305113427600 = 5312806^2 + 1518260^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30531021021199 and 30531021021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30531021021233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3816377627651 + ... + 3816377627658.

It is an arithmetic number, because the mean of its divisors is an integer number (8904881131195).

Almost surely, 2^{30531021021236} is an apocalyptic number.

It is an amenable number.

30531021021236 is a deficient number, since it is larger than the sum of its proper divisors (22898265765934).

30531021021236 is a wasteful number, since it uses less digits than its factorization.

30531021021236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7632755255313 (or 7632755255311 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 30531021021236 its reverse (63212012013503), we get a palindrome (93743033034739).

The spelling of 30531021021236 in words is "thirty trillion, five hundred thirty-one billion, twenty-one million, twenty-one thousand, two hundred thirty-six".