21213141415505 has 64 divisors (see below), whose sum is σ = 28872191577600. Its totient is φ = 14858182563840.

The previous prime is 21213141415483. The next prime is 21213141415559. The reversal of 21213141415505 is 50551414131212.

It is a happy number.

It is not a de Polignac number, because 21213141415505 - 2⁶ = 21213141415441 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14499266 + ... + 15895124.

It is an arithmetic number, because the mean of its divisors is an integer number (451127993400).

Almost surely, 2^{21213141415505} is an apocalyptic number.

It is an amenable number.

21213141415505 is a deficient number, since it is larger than the sum of its proper divisors (7659050162095).

21213141415505 is a wasteful number, since it uses less digits than its factorization.

21213141415505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396074.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 21213141415505 its reverse (50551414131212), we get a palindrome (71764555546717).

The spelling of 21213141415505 in words is "twenty-one trillion, two hundred thirteen billion, one hundred forty-one million, four hundred fifteen thousand, five hundred five".