21404317455064 has 16 divisors (see below), whose sum is σ = 40153052043720. Its totient is φ = 10696836910080.

The previous prime is 21404317455011. The next prime is 21404317455109. The reversal of 21404317455064 is 46055471340412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665210089 + ... + 665242264.

Almost surely, 2^{21404317455064} is an apocalyptic number.

It is an amenable number.

21404317455064 is a deficient number, since it is larger than the sum of its proper divisors (18748734588656).

21404317455064 is a wasteful number, since it uses less digits than its factorization.

21404317455064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330454370 (or 1330454366 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 46.

Adding to 21404317455064 its reverse (46055471340412), we get a palindrome (67459788795476).

The spelling of 21404317455064 in words is "twenty-one trillion, four hundred four billion, three hundred seventeen million, four hundred fifty-five thousand, sixty-four".