21213544055064 has 64 divisors (see below), whose sum is σ = 54830036090880. Its totient is φ = 6832402944000.

The previous prime is 21213544055021. The next prime is 21213544055149. The reversal of 21213544055064 is 46055044531212.

It is a super-2 number, since 2×21213544055064² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21763992 + ... + 22717799.

It is an arithmetic number, because the mean of its divisors is an integer number (856719313920).

Almost surely, 2^{21213544055064} is an apocalyptic number.

21213544055064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21213544055064 is an abundant number, since it is smaller than the sum of its proper divisors (33616492035816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213544055064 is a wasteful number, since it uses less digits than its factorization.

21213544055064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44482472 (or 44482468 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21213544055064 its reverse (46055044531212), we get a palindrome (67268588586276).

The spelling of 21213544055064 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-four million, fifty-five thousand, sixty-four".