21530501031245 has 8 divisors (see below), whose sum is σ = 25836845654016. Its totient is φ = 17224237880656.

The previous prime is 21530501031211. The next prime is 21530501031253. The reversal of 21530501031245 is 54213010503512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530501031245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19785137 + ... + 20844966.

It is an arithmetic number, because the mean of its divisors is an integer number (3229605706752).

Almost surely, 2^{21530501031245} is an apocalyptic number.

It is an amenable number.

21530501031245 is a deficient number, since it is larger than the sum of its proper divisors (4306344622771).

21530501031245 is a wasteful number, since it uses less digits than its factorization.

21530501031245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40736091.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 21530501031245 its reverse (54213010503512), we get a palindrome (75743511534757).

The spelling of 21530501031245 in words is "twenty-one trillion, five hundred thirty billion, five hundred one million, thirty-one thousand, two hundred forty-five".