21036104064 has 96 divisors (see below), whose sum is σ = 60565368240. Its totient is φ = 7008353280.

The previous prime is 21036104051. The next prime is 21036104107. The reversal of 21036104064 is 46040163012.

21036104064 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 610 + 40 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×21036104064³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3015909 + ... + 3022875.

Almost surely, 2^21036104064 is an apocalyptic number.

21036104064 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 21036104064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30282684120).

21036104064 is an abundant number, since it is smaller than the sum of its proper divisors (39529264176).

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

21036104064 is a wasteful number, since it uses less digits than its factorization.

21036104064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9608 (or 9593 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21036104064 its reverse (46040163012), we get a palindrome (67076267076).

The spelling of 21036104064 in words is "twenty-one billion, thirty-six million, one hundred four thousand, sixty-four".