21213560223021 has 8 divisors (see below), whose sum is σ = 29197158156544. Its totient is φ = 13686167885760.

The previous prime is 21213560223013. The next prime is 21213560223133. The reversal of 21213560223021 is 12032206531212.

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

It is not a de Polignac number, because 21213560223021 - 2³ = 21213560223013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213560223021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213560222021) by changing a digit.

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, 114051398956 + ... + 114051399141.

It is an arithmetic number, because the mean of its divisors is an integer number (3649644769568).

Almost surely, 2^{21213560223021} is an apocalyptic number.

It is an amenable number.

21213560223021 is a deficient number, since it is larger than the sum of its proper divisors (7983597933523).

21213560223021 is a wasteful number, since it uses less digits than its factorization.

21213560223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228102798131.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21213560223021 its reverse (12032206531212), we get a palindrome (33245766754233).

The spelling of 21213560223021 in words is "twenty-one trillion, two hundred thirteen billion, five hundred sixty million, two hundred twenty-three thousand, twenty-one".