21818314059504 has 160 divisors (see below), whose sum is σ = 57454140699648. Its totient is φ = 7132820352000.

The previous prime is 21818314059497. The next prime is 21818314059557. The reversal of 21818314059504 is 40595041381812.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2136740959 + ... + 2136751169.

Almost surely, 2^{21818314059504} is an apocalyptic number.

21818314059504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21818314059504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28727070349824).

21818314059504 is an abundant number, since it is smaller than the sum of its proper divisors (35635826640144).

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

21818314059504 is a wasteful number, since it uses less digits than its factorization.

21818314059504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12327 (or 12321 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 21818314059504 in words is "twenty-one trillion, eight hundred eighteen billion, three hundred fourteen million, fifty-nine thousand, five hundred four".