21086354016 has 144 divisors (see below), whose sum is σ = 73802330784. Its totient is φ = 5561229312.

The previous prime is 21086353993. The next prime is 21086354027. The reversal of 21086354016 is 61045368012.

It is a happy number.

21086354016 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 635 + 4 + 0 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376081 + ... + 428496.

It is an arithmetic number, because the mean of its divisors is an integer number (512516186).

Almost surely, 2^21086354016 is an apocalyptic number.

21086354016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21086354016 is an abundant number, since it is smaller than the sum of its proper divisors (52715976768).

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

21086354016 is a wasteful number, since it uses less digits than its factorization.

21086354016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804613 (or 804602 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21086354016 in words is "twenty-one billion, eighty-six million, three hundred fifty-four thousand, sixteen".