21236130016 has 12 divisors (see below), whose sum is σ = 41808631032. Its totient is φ = 10618064992.

The previous prime is 21236130011. The next prime is 21236130049. The reversal of 21236130016 is 61003163212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236130011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331814500 + ... + 331814563.

It is an arithmetic number, because the mean of its divisors is an integer number (3484052586).

Almost surely, 2^21236130016 is an apocalyptic number.

It is an amenable number.

21236130016 is a deficient number, since it is larger than the sum of its proper divisors (20572501016).

21236130016 is an equidigital number, since it uses as much as digits as its factorization.

21236130016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663629073 (or 663629065 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21236130016 its reverse (61003163212), we get a palindrome (82239293228).

The spelling of 21236130016 in words is "twenty-one billion, two hundred thirty-six million, one hundred thirty thousand, sixteen".