21213560331405 has 96 divisors (see below), whose sum is σ = 39788551735296. Its totient is φ = 10393543060992.

The previous prime is 21213560331389. The next prime is 21213560331427. The reversal of 21213560331405 is 50413306531212.

21213560331405 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 5 + 603 + 3 + 1 + 40 + 5 = 666.

It is not a de Polignac number, because 21213560331405 - 2⁴ = 21213560331389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213560331405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 451742187 + ... + 451789143.

It is an arithmetic number, because the mean of its divisors is an integer number (414464080576).

Almost surely, 2^{21213560331405} is an apocalyptic number.

It is an amenable number.

21213560331405 is a deficient number, since it is larger than the sum of its proper divisors (18574991403891).

21213560331405 is a wasteful number, since it uses less digits than its factorization.

21213560331405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50667 (or 50664 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 21213560331405 its reverse (50413306531212), we get a palindrome (71626866862617).

The spelling of 21213560331405 in words is "twenty-one trillion, two hundred thirteen billion, five hundred sixty million, three hundred thirty-one thousand, four hundred five".