21040323355215 has 24 divisors (see below), whose sum is σ = 36474506787888. Its totient is φ = 11220086413440.

The previous prime is 21040323355127. The next prime is 21040323355277. The reversal of 21040323355215 is 51255332304012.

21040323355215 is a `hidden beast` number, since 2 + 1 + 0 + 40 + 32 + 33 + 552 + 1 + 5 = 666.

It is not a de Polignac number, because 21040323355215 - 2⁹ = 21040323354703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21040323355215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29210566 + ... + 29922195.

It is an arithmetic number, because the mean of its divisors is an integer number (1519771116162).

Almost surely, 2^{21040323355215} is an apocalyptic number.

21040323355215 is a deficient number, since it is larger than the sum of its proper divisors (15434183432673).

21040323355215 is a wasteful number, since it uses less digits than its factorization.

21040323355215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59140679 (or 59140676 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 21040323355215 its reverse (51255332304012), we get a palindrome (72295655659227).

The spelling of 21040323355215 in words is "twenty-one trillion, forty billion, three hundred twenty-three million, three hundred fifty-five thousand, two hundred fifteen".