21500235252002 has 16 divisors (see below), whose sum is σ = 36774158033592. Its totient is φ = 9339468706560.

The previous prime is 21500235251977. The next prime is 21500235252017. The reversal of 21500235252002 is 20025253200512.

It can be written as a sum of positive squares in 4 ways, for example, as 18814435428721 + 2685799823281 = 4337561^2 + 1638841^2 .

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, 24321532649 + ... + 24321533532.

Almost surely, 2^{21500235252002} is an apocalyptic number.

21500235252002 is a deficient number, since it is larger than the sum of its proper divisors (15273922781590).

21500235252002 is a wasteful number, since it uses less digits than its factorization.

21500235252002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48643066213.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 21500235252002 its reverse (20025253200512), we get a palindrome (41525488452514).

The spelling of 21500235252002 in words is "twenty-one trillion, five hundred billion, two hundred thirty-five million, two hundred fifty-two thousand, two".