21213363061405 has 8 divisors (see below), whose sum is σ = 26953449536952. Its totient is φ = 15972414540288.

The previous prime is 21213363061399. The next prime is 21213363061417. The reversal of 21213363061405 is 50416036331212.

It can be written as a sum of positive squares in 4 ways, for example, as 6805242646596 + 14408120414809 = 2608686^2 + 3795803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213363061405 - 2⁹ = 21213363060893 is a prime.

It is a super-2 number, since 2×21213363061405² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 124784488512 + ... + 124784488681.

It is an arithmetic number, because the mean of its divisors is an integer number (3369181192119).

Almost surely, 2^{21213363061405} is an apocalyptic number.

It is an amenable number.

21213363061405 is a deficient number, since it is larger than the sum of its proper divisors (5740086475547).

21213363061405 is a wasteful number, since it uses less digits than its factorization.

21213363061405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249568977215.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 21213363061405 its reverse (50416036331212), we get a palindrome (71629399392617).

The spelling of 21213363061405 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-three million, sixty-one thousand, four hundred five".