21213363061406 has 8 divisors (see below), whose sum is σ = 31820470064760. Its totient is φ = 10606539706488.

The previous prime is 21213363061399. The next prime is 21213363061417. The reversal of 21213363061406 is 60416036331212.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213363061406.

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 3 ways as a sum of consecutive naturals, for example, 70725041 + ... + 71024348.

It is an arithmetic number, because the mean of its divisors is an integer number (3977558758095).

Almost surely, 2^{21213363061406} is an apocalyptic number.

21213363061406 is a deficient number, since it is larger than the sum of its proper divisors (10607107003354).

21213363061406 is a wasteful number, since it uses less digits than its factorization.

21213363061406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141824218.

The product of its (nonzero) digits is 93312, while the sum is 38.

Adding to 21213363061406 its reverse (60416036331212), we get a palindrome (81629399392618).

The spelling of 21213363061406 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-three million, sixty-one thousand, four hundred six".