21356486704 has 160 divisors (see below), whose sum is σ = 51725260800. Its totient is φ = 8334627840.

The previous prime is 21356486699. The next prime is 21356486713. The reversal of 21356486704 is 40768465312.

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, 16723314 + ... + 16724590.

It is an arithmetic number, because the mean of its divisors is an integer number (323282880).

Almost surely, 2^21356486704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21356486704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25862630400).

21356486704 is an abundant number, since it is smaller than the sum of its proper divisors (30368774096).

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

21356486704 is a wasteful number, since it uses less digits than its factorization.

21356486704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 21356486704 in words is "twenty-one billion, three hundred fifty-six million, four hundred eighty-six thousand, seven hundred four".