21699201984064 has 56 divisors (see below), whose sum is σ = 46981524198816. Its totient is φ = 9861660288000.

The previous prime is 21699201984013. The next prime is 21699201984073. The reversal of 21699201984064 is 46048910299612.

It is a junction number, because it is equal to n+sod(n) for n = 21699201983993 and 21699201984011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1791399 + ... + 6826969.

Almost surely, 2^{21699201984064} is an apocalyptic number.

It is an amenable number.

21699201984064 is an abundant number, since it is smaller than the sum of its proper divisors (25282322214752).

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

21699201984064 is a wasteful number, since it uses less digits than its factorization.

21699201984064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041715 (or 5041705 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 21699201984064 in words is "twenty-one trillion, six hundred ninety-nine billion, two hundred one million, nine hundred eighty-four thousand, sixty-four".