21500232152312 has 8 divisors (see below), whose sum is σ = 40312935285600. Its totient is φ = 10750116076152.

The previous prime is 21500232152303. The next prime is 21500232152317. The reversal of 21500232152312 is 21325123200512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500232152317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343764509512 + ... + 1343764509527.

It is an arithmetic number, because the mean of its divisors is an integer number (5039116910700).

Almost surely, 2^{21500232152312} is an apocalyptic number.

It is an amenable number.

21500232152312 is a deficient number, since it is larger than the sum of its proper divisors (18812703133288).

21500232152312 is a wasteful number, since it uses less digits than its factorization.

21500232152312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687529019045 (or 2687529019041 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21500232152312 its reverse (21325123200512), we get a palindrome (42825355352824).

The spelling of 21500232152312 in words is "twenty-one trillion, five hundred billion, two hundred thirty-two million, one hundred fifty-two thousand, three hundred twelve".