21500450445201 has 64 divisors (see below), whose sum is σ = 35904899606016. Its totient is φ = 11141386444800.

The previous prime is 21500450445179. The next prime is 21500450445241. The reversal of 21500450445201 is 10254405400512.

It is a happy number.

It is not a de Polignac number, because 21500450445201 - 2¹⁰ = 21500450444177 is a prime.

It is a super-3 number, since 3×21500450445201³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21500450445241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12885825 + ... + 14458401.

It is an arithmetic number, because the mean of its divisors is an integer number (561014056344).

Almost surely, 2^{21500450445201} is an apocalyptic number.

21500450445201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21500450445201 is a deficient number, since it is larger than the sum of its proper divisors (14404449160815).

21500450445201 is a wasteful number, since it uses less digits than its factorization.

21500450445201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573482.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 21500450445201 its reverse (10254405400512), we get a palindrome (31754855845713).

The spelling of 21500450445201 in words is "twenty-one trillion, five hundred billion, four hundred fifty million, four hundred forty-five thousand, two hundred one".